Question 1

A Hall voltage of 15  μ\muμ  V is measured across a 4.0-mm side of a metal slab immersed in a magnetic field whose strength is 0.150 T. The average velocity of the charges is

Accepted Answer

A)   2.5 cm/s.
B)   5.0 cm/s.
C)   7.5 cm/s.
D)   The value cannot be obtained from the information given. E) C) and D)
F) B) and C)

Question 2

Materials with a small positive magnetic susceptibility are called

Accepted Answer

A)   paramagnets.
B)   diamagnets.
C)   ferromagnets.
D)   permanent magnets.E) A) and B)
F) A) and C)

Question 3

The SI units associated with magnetic permeability are

Accepted Answer

A)   N·s/C.
B)   N·s2/C.
C)   N·s2/C2.
D)   Hold on; the magnetic permeability is dimensionless.E) A) and B)
F) A) and C)

Question 4

An electron travels in the +x direction with a velocity of 1.5 *106 m/s. It enters an E * B velocity selector that utilizes a cross electric and magnetic field to produce a zero net force on the particle. The magnitude of the magnetic field is 0.10 T in the +y direction. The magnitude of the electric field required to produce a straight-line trajectory is

Accepted Answer

A)   1.5 * 105 V/m in the +z direction.
B)   1.5 *05 V/m in the -z direction.
C)   1.5 * 105 V/m in the +y direction.
D)   1.5 * 105 V/m in the -y direction.E) C) and D)
F) A) and D)

Question 5

A force per unit length of 48  μ\muμ  N/m is produced when two wires separated by 1.5 mm both carry the same current. The current the wires carry is

Accepted Answer

A)   0.36 A.
B)   0.60 A.
C)   0.77 A.
D)   1.0 A. E) A) and C)
F) C) and D)

Question 6

A rectangular loop of wire whose dimensions are 15 cm * 25 cm carries a current of 5.0 A. The loop is in a uniform magnetic field of 1.5 T whose direction is perpendicular to the plane of the loop. The torque acting on the loop is

Accepted Answer

A)   zero.
B)   0.24 N·m.
C)   0.28 N·m.
D)   0.35 N·m.E) B) and C)
F) None of the above

Question 7

One side of a square loop (dimensions of 15 cm * 15 cm)  runs parallel to a current-carrying wire Iw = 5.0 A, and 3.0 A runs through the loop. The net force on the loop is 2.7 * 10-6 N. The distance between the side of the loop and the wire is

Accepted Answer

A)   5.0 cm.
B)   10 cm.
C)   15 cm.
D)   20 cm.E) B) and C)
F) A) and B)

Question 8

The SI unit associate with the magnetic moment μ\muμ , is

Accepted Answer

A)   ampere·m2.
B)   ampere/m2.
C)   ampere2·m.
D)   ampere2/m2. E) A) and B)
F) A) and C)

Question 9

The magnitude of the torque produced by a magnetic moment  μ\muμ   = 2.0 (2i + j)  A·m2 in a magnetic field given by 1.5 (i + 4k)  mT is

Accepted Answer

A)   zero.
B)   3 mN·m.
C)   9 mN·m.
D)   27 mN·m. E) B) and C)
F) A) and D)

Question 10

The charge carriers in a metal are typically negative. A positive charge carrier

Accepted Answer

A)   will not change the sign of the Hall potential.
B)   will change the sign of the Hall potential.
C)   will have a zero Hall potential.
D)   will produce a Hall effect across the other face of the metal.E) All of the above
F) C) and D)

Question 11

The energy of an electron is 100eV when it enters an E * B velocity selector that utilizes a cross electric and magnetic field to produce a zero net force on the particle. The magnitude of the magnetic field is 0.085T. The magnitude of the electric field required to produce a straight-line trajectory is

Accepted Answer

A)   5.0 *104 V/m.
B)   2.5 * 105 V/m.
C)   5.0 * 105 V/m.
D)   2.5 * 106 V/m.E) A) and B)
F) B) and C)

Question 12

The potential energy of a magnetic moment  μ\muμ   = 1.0 (2i + j)  A·m2 in a magnetic field given by 1.5 (2i + k)  mT is

Accepted Answer

A)   -6.0 mJ.
B)   -3.0 mJ.
C)   3.0 mJ.
D)   -1.5 mJ. E) B) and D)
F) A) and D)

Question 13

An electron is accelerated to an energy of 100 eV and then enters a magnetic field of strength 0.15 T. The resulting radius of the electron's trajectory is

Accepted Answer

A)   2.2 * 10-4 m.
B)   3.3 *10-4 m.
C)   4.4 * 10-4 m.
D)   5.5 * 10-4 m.E) None of the above
F) B) and C)

Question 14

For a magnetic material the ratio of the magnetic permeability to the permeability of free space is 11. The material is placed in a uniform magnetic field of strength 1.0 mT. The magnetic field produced in the material is approximately

Accepted Answer

A)   11 mT.
B)   10 mT.
C)   1.2 mT.
D)   1.0 mT.E) None of the above
F) B) and C)

Question 15

Two parallel wires separated by 1.5 cm both carry 1.5 A of current. The magnitude of the force per unit length on one of the wires is

Accepted Answer

A)   7.5  μ\muμ  N/m.
B)   15  μ\muμ  N/m.
C)   20 μ\muμ  N/m.
D)   30.  μ\muμ  N/m. E) C) and D)
F) B) and D)

Question 16

A Hall voltage is measured to be 15  μ\muμ  V across the 3.0-mm dimension of a slab of copper whose overall dimensions are 2.0 * 3.0 *25.4 mm. The current passing through the copper is 20.0 A, while the magnetic field is 0.010 T. The density of the charge carriers in the material is

Accepted Answer

A)   3.3 *1024 m-3.
B)   2.8 *1025 m-3.
C)   4.2* 1025 m-3. D) B) and C)
E) None of the above

Question 17

The current in a wire is directed along the x axis in a uniform magnetic field that is directed along the negative x axis. The force on the wire is along the

Accepted Answer

A)   x axis.
B)   -y axis.
C)   z axis.
D)   There is no force on the wire.E) A) and B)
F) C) and D)

Question 18

A loop of wire has an area of 0.10 m2 and carries 15 mA of current. The magnetic moment of the loop is

Accepted Answer

A)   0.001 A·m2.
B)   0.15 A/m2.
C)   71 *10-5 A2/m.
D)   2.25 A2/m2.E) None of the above
F) B) and D)

Question 19

The force produced by two parallel wires with currents running in the same direction will be

Accepted Answer

A)   attractive.
B)   repulsive.
C)   along the axis of symmetry.
D)   zero.E) B) and D)
F) All of the above

Question 20

A 100-turn loop of wire whose area is 0.15 m2 carries 3.0 A of current. If a uniform magnetic field of 2.0 T makes an angle of 60° with the plane of the loop, the maximum torque on the loop is

Accepted Answer

A)   zero.
B)   5.0 N·m.
C)   15 N·m.
D)   45 N·m.E) All of the above
F) None of the above

Exam 30: Charges and Currents in Magnetic Fields

Correct Answer
verified

The SI units associated with magnetic permeability are

Correct Answer
verified

A 100-turn loop of wire whose area is 0.15 m² carries 3.0 A of current. If a uniform magnetic field of 2.0 T makes an angle of 60° with the plane of the loop, the maximum torque on the loop is

Correct Answer
verified

Correct Answer
verified

A Hall voltage is measured to be 15 $\mu$ V across the 3.0-mm dimension of a slab of copper whose overall dimensions are 2.0 * 3.0 *25.4 mm. The current passing through the copper is 20.0 A, while the magnetic field is 0.010 T. The density of the charge carriers in the material is

Correct Answer
verified

The force produced by two parallel wires with currents running in the same direction will be

Correct Answer
verified

A rectangular loop of wire whose dimensions are 15 cm * 25 cm carries a current of 5.0 A. The loop is in a uniform magnetic field of 1.5 T whose direction is perpendicular to the plane of the loop. The torque acting on the loop is

Correct Answer
verified

The potential energy of a magnetic moment $\mu$ = 1.0 (2i + j) A·m² in a magnetic field given by 1.5 (2i + k) mT is

Correct Answer
verified

The charge carriers in a metal are typically negative. A positive charge carrier

Correct Answer
verified

A loop of wire has an area of 0.10 m² and carries 15 mA of current. The magnetic moment of the loop is

Correct Answer
verified

Materials with a small positive magnetic susceptibility are called

Correct Answer
verified

The current in a wire is directed along the x axis in a uniform magnetic field that is directed along the negative x axis. The force on the wire is along the

Correct Answer
verified

The magnitude of the torque produced by a magnetic moment $\mu$ = 2.0 (2i + j) A·m² in a magnetic field given by 1.5 (i + 4k) mT is

Correct Answer
verified

A force per unit length of 48 $\mu$ N/m is produced when two wires separated by 1.5 mm both carry the same current. The current the wires carry is

Correct Answer
verified

An electron is accelerated to an energy of 100 eV and then enters a magnetic field of strength 0.15 T. The resulting radius of the electron's trajectory is

Correct Answer
verified

The SI unit associate with the magnetic moment $\mu$ , is

Correct Answer
verified

One side of a square loop (dimensions of 15 cm * 15 cm) runs parallel to a current-carrying wire I_w = 5.0 A, and 3.0 A runs through the loop. The net force on the loop is 2.7 * 10^-6 N. The distance between the side of the loop and the wire is

Correct Answer
verified

For a magnetic material the ratio of the magnetic permeability to the permeability of free space is 11. The material is placed in a uniform magnetic field of strength 1.0 mT. The magnetic field produced in the material is approximately

Correct Answer
verified

Two parallel wires separated by 1.5 cm both carry 1.5 A of current. The magnitude of the force per unit length on one of the wires is

Correct Answer
verified

A Hall voltage of 15 $\mu$ V is measured across a 4.0-mm side of a metal slab immersed in a magnetic field whose strength is 0.150 T. The average velocity of the charges is

Correct Answer
verified

Exam 30: Charges and Currents in Magnetic Fields

Correct AnswerverifiedShow Answer

The SI units associated with magnetic permeability are

Correct AnswerverifiedShow Answer

A 100-turn loop of wire whose area is 0.15 m2 carries 3.0 A of current. If a uniform magnetic field of 2.0 T makes an angle of 60° with the plane of the loop, the maximum torque on the loop is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A Hall voltage is measured to be 15 μ\muμ V across the 3.0-mm dimension of a slab of copper whose overall dimensions are 2.0 * 3.0 *25.4 mm. The current passing through the copper is 20.0 A, while the magnetic field is 0.010 T. The density of the charge carriers in the material is

Correct AnswerverifiedShow Answer

The force produced by two parallel wires with currents running in the same direction will be

Correct AnswerverifiedShow Answer

A rectangular loop of wire whose dimensions are 15 cm * 25 cm carries a current of 5.0 A. The loop is in a uniform magnetic field of 1.5 T whose direction is perpendicular to the plane of the loop. The torque acting on the loop is

Correct AnswerverifiedShow Answer

The potential energy of a magnetic moment μ\muμ = 1.0 (2i + j) A·m2 in a magnetic field given by 1.5 (2i + k) mT is

Correct AnswerverifiedShow Answer

The charge carriers in a metal are typically negative. A positive charge carrier

Correct AnswerverifiedShow Answer

A loop of wire has an area of 0.10 m2 and carries 15 mA of current. The magnetic moment of the loop is

Correct AnswerverifiedShow Answer

Materials with a small positive magnetic susceptibility are called

Correct AnswerverifiedShow Answer

The current in a wire is directed along the x axis in a uniform magnetic field that is directed along the negative x axis. The force on the wire is along the

Correct AnswerverifiedShow Answer

The magnitude of the torque produced by a magnetic moment μ\muμ = 2.0 (2i + j) A·m2 in a magnetic field given by 1.5 (i + 4k) mT is

Correct AnswerverifiedShow Answer

A force per unit length of 48 μ\muμ N/m is produced when two wires separated by 1.5 mm both carry the same current. The current the wires carry is

Correct AnswerverifiedShow Answer

An electron is accelerated to an energy of 100 eV and then enters a magnetic field of strength 0.15 T. The resulting radius of the electron's trajectory is

Correct AnswerverifiedShow Answer

The SI unit associate with the magnetic moment μ\muμ , is

Correct AnswerverifiedShow Answer

One side of a square loop (dimensions of 15 cm * 15 cm) runs parallel to a current-carrying wire Iw = 5.0 A, and 3.0 A runs through the loop. The net force on the loop is 2.7 * 10-6 N. The distance between the side of the loop and the wire is

Correct AnswerverifiedShow Answer

For a magnetic material the ratio of the magnetic permeability to the permeability of free space is 11. The material is placed in a uniform magnetic field of strength 1.0 mT. The magnetic field produced in the material is approximately

Correct AnswerverifiedShow Answer

Two parallel wires separated by 1.5 cm both carry 1.5 A of current. The magnitude of the force per unit length on one of the wires is

Correct AnswerverifiedShow Answer

A Hall voltage of 15 μ\muμ V is measured across a 4.0-mm side of a metal slab immersed in a magnetic field whose strength is 0.150 T. The average velocity of the charges is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

A 100-turn loop of wire whose area is 0.15 m² carries 3.0 A of current. If a uniform magnetic field of 2.0 T makes an angle of 60° with the plane of the loop, the maximum torque on the loop is

Correct Answer
verified

Correct Answer
verified

A Hall voltage is measured to be 15 $\mu$ V across the 3.0-mm dimension of a slab of copper whose overall dimensions are 2.0 * 3.0 *25.4 mm. The current passing through the copper is 20.0 A, while the magnetic field is 0.010 T. The density of the charge carriers in the material is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The potential energy of a magnetic moment $\mu$ = 1.0 (2i + j) A·m² in a magnetic field given by 1.5 (2i + k) mT is

Correct Answer
verified

Correct Answer
verified

A loop of wire has an area of 0.10 m² and carries 15 mA of current. The magnetic moment of the loop is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The magnitude of the torque produced by a magnetic moment $\mu$ = 2.0 (2i + j) A·m² in a magnetic field given by 1.5 (i + 4k) mT is

Correct Answer
verified

A force per unit length of 48 $\mu$ N/m is produced when two wires separated by 1.5 mm both carry the same current. The current the wires carry is

Correct Answer
verified

Correct Answer
verified

The SI unit associate with the magnetic moment $\mu$ , is

Correct Answer
verified

One side of a square loop (dimensions of 15 cm * 15 cm) runs parallel to a current-carrying wire I_w = 5.0 A, and 3.0 A runs through the loop. The net force on the loop is 2.7 * 10^-6 N. The distance between the side of the loop and the wire is

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A Hall voltage of 15 $\mu$ V is measured across a 4.0-mm side of a metal slab immersed in a magnetic field whose strength is 0.150 T. The average velocity of the charges is

Correct Answer
verified