Question 1

The soft iron core in the solenoid shown is removable.Then:

Accepted Answer

A) the current will be larger without the core 
B) the current will be larger with the core 
C) one must do work to remove the core 
D) the circuit will do work in expelling the core 
E) the stored energy is the same with or without the core 
A) the current will be larger without the core 
B) the current will be larger with the core 
C) one must do work to remove the core 
D) the circuit will do work in expelling the core 
E) the stored energy is the same with or without the core

Question 2

Displacement current exists wherever there is:

Accepted Answer

A) moving charge 
B) a magnetic field 
C) a changing magnetic field 
D) an electric field 
E) a changing electric field 
A) moving charge 
B) a magnetic field 
C) a changing magnetic field 
D) an electric field 
E) a changing electric field

Question 3

A bar magnet is broken in half.Each half is broken in half again, etc.The observation is that each piece has both a north and south pole.This is usually explained by:

Accepted Answer

A) Ampere's theory that all magnetic phenomena result from electric currents 
B) our inability to divide the magnet into small enough pieces 
C) Coulomb's law 
D) Lenz' law 
E) conservation of charge 
A) Ampere's theory that all magnetic phenomena result from electric currents 
B) our inability to divide the magnet into small enough pieces 
C) Coulomb's law 
D) Lenz' law 
E) conservation of charge

Question 4

What are the possible allowed values of the orbital magnetic quantum number mℓ of the electron?

Accepted Answer

A) 0 only 
B) 0, ±1 only 
C) any half-odd integer 
D) 0, ±1, ±2, …, up to the maximum value for that orbit 
E) It depends on the external magnetic field. 
A) 0 only 
B) 0, ±1 only 
C) any half-odd integer 
D) 0, ±1, ±2, …, up to the maximum value for that orbit 
E) It depends on the external magnetic field.

Question 5

The magnetic field of Earth is roughly the same as that of a magnetic dipole with a dipole moment of about:

Accepted Answer

A) 1017 J/T 
B) 1019 J/T 
C) 1021 J/T 
D) 1023 J/T 
E) 1025 J/T 
A) 1017 J/T 
B) 1019 J/T 
C) 1021 J/T 
D) 1023 J/T 
E) 1025 J/T

Question 6

A 1-A current is used to charge a parallel plate capacitor.A large square piece of paper is placed between the plates and parallel to them so it sticks out on all sides.The value of the integral   around the perimeter of the paper is:

Accepted Answer

A) 2 T . m 
B) 4 $\pi$  * 10-7 T.m 
C) 8.85 *10-12 T.m 
D) 10-7 T.m 
E) not determined from the given quantities 
A) 2 T . m 
B) 4 $\pi$  * 10-7 T.m 
C) 8.85 *10-12 T.m 
D) 10-7 T.m 
E) not determined from the given quantities

Question 7

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right.For them:

Accepted Answer

A) the path must pierce the area 
B) the path must be well-separated from the area 
C) the path must be along a field line and the area must be perpendicular to the field line 
D) the path must be the boundary of the area 
E) the path must lie in the area, away from its boundary 
A) the path must pierce the area 
B) the path must be well-separated from the area 
C) the path must be along a field line and the area must be perpendicular to the field line 
D) the path must be the boundary of the area 
E) the path must lie in the area, away from its boundary

Question 8

A magnetic field   is applied to a diamagnetic substance.In the interior the magnetic field produced by the magnetic dipoles of the substance is:

Accepted Answer

A) greater than   and in the opposite direction 
B) less than   and in the opposite direction 
C) greater than   and in the same direction 
D) less than   and in the same direction 
E) the same as   
A) greater than   and in the opposite direction 
B) less than   and in the opposite direction 
C) greater than   and in the same direction 
D) less than   and in the same direction 
E) the same as

Question 9

An electron is on the z axis moving toward the xy plane but it has not reached that plane yet.At that instant:

Accepted Answer

A) there is only a true current through the xy plane 
B) there is only a displacement current through the xy plane 
C) there are both true and displacement currents through the xy plane 
D) there is neither a true nor a displacement current through the xy plane 
E) none of the above are true 
A) there is only a true current through the xy plane 
B) there is only a displacement current through the xy plane 
C) there are both true and displacement currents through the xy plane 
D) there is neither a true nor a displacement current through the xy plane 
E) none of the above are true

Question 10

A circular parallel-plate capacitor whose plates have a radius of 25 cm is being charged with a current of 1.3 A.What is the magnetic field 11 cm from the center of the plates?

Accepted Answer

A) 4.6 x 10-7 T 
B) 1.0 x 10-6 T 
C) 2.4 x 10-6 T 
D) 3.1 x 10-6 T 
E) 6.2 x 10-6 T 
A) 4.6 x 10-7 T 
B) 1.0 x 10-6 T 
C) 2.4 x 10-6 T 
D) 3.1 x 10-6 T 
E) 6.2 x 10-6 T

Question 11

Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic)which are used to make permanent magnets?

Accepted Answer

A) only diamagnetic 
B) only ferromagnetic 
C) only paramagnetic 
D) only paramagnetic and ferromagnetic 
E) all three 
A) only diamagnetic 
B) only ferromagnetic 
C) only paramagnetic 
D) only paramagnetic and ferromagnetic 
E) all three

Question 12

The magnetic field lines due to an ordinary bar magnet:

Accepted Answer

A) form closed curves 
B) cross one another near the poles 
C) are more numerous near the N pole than near the S pole 
D) leave the S pole, loop around the outside of the magnet, and enter the N pole 
E) none of the above 
A) form closed curves 
B) cross one another near the poles 
C) are more numerous near the N pole than near the S pole 
D) leave the S pole, loop around the outside of the magnet, and enter the N pole 
E) none of the above

Question 13

A magnetic field parallel to the x axis with a magnitude that decreases with increasing x but does not change with y and z is impossible according to:

Accepted Answer

A) Faraday's law 
B) Ampere's law 
C) Gauss' law for electricity 
D) Gauss' law for magnetism 
E) Newton's second law 
A) Faraday's law 
B) Ampere's law 
C) Gauss' law for electricity 
D) Gauss' law for magnetism 
E) Newton's second law

Question 14

Magnetization vectors in neighboring ferromagnetic domains are:

Accepted Answer

A) always in opposite directions 
B) always in the same direction 
C) always in different directions 
D) sometimes in different directions and sometimes in the same direction 
E) sometimes in opposite directions and sometimes in the same direction 
A) always in opposite directions 
B) always in the same direction 
C) always in different directions 
D) sometimes in different directions and sometimes in the same direction 
E) sometimes in opposite directions and sometimes in the same direction

Question 15

One of the Maxwell equations begins with   ....The o symbol in the integral sign means:

Accepted Answer

A) the same as the subscript in   
B) integrate clockwise around the path 
C) integrate counterclockwise around the path 
D) integrate around a closed path 
E) integrate over a closed surface 
A) the same as the subscript in   
B) integrate clockwise around the path 
C) integrate counterclockwise around the path 
D) integrate around a closed path 
E) integrate over a closed surface

Question 16

Paramagnetism is closely associated with:

Accepted Answer

A) the tendency of electron dipole moments to align with an applied magnetic field 
B) the tendency of electron dipole moments to align opposite to an applied magnetic field 
C) the exchange force between electrons 
D) the force exerted by electron dipole moments on each other 
E) the torque exerted by electron dipole moments on each other 
A) the tendency of electron dipole moments to align with an applied magnetic field 
B) the tendency of electron dipole moments to align opposite to an applied magnetic field 
C) the exchange force between electrons 
D) the force exerted by electron dipole moments on each other 
E) the torque exerted by electron dipole moments on each other

Question 17

Of the following places one would expect that the horizontal component of the Earth's magnetic field to be largest in:

Accepted Answer

A) Maine 
B) Florida 
C) Maryland 
D) New York 
E) Iowa 
A) Maine 
B) Florida 
C) Maryland 
D) New York 
E) Iowa

Question 18

A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 *1012 V/m.s.The magnetic field at a point 1.2 m from the axis has a magnitude of:

Accepted Answer

A) 0 T 
B) 7.0* 10-6 T 
C) 1.1 * 10-5 T 
D) 2.3 * 10-5 T 
E) 2.8 * 10-5 T 
A) 0 T 
B) 7.0* 10-6 T 
C) 1.1 * 10-5 T 
D) 2.3 * 10-5 T 
E) 2.8 * 10-5 T

Question 19

A magnetic field   is applied to a paramagnetic substance.In the interior the magnetic field produced by the magnetic dipoles of the substance is:

Accepted Answer

A) greater than   and in the opposite direction 
B) less than   and in the opposite direction 
C) greater than   and in the same direction 
D) less than   and in the same direction 
E) the same as   
A) greater than   and in the opposite direction 
B) less than   and in the opposite direction 
C) greater than   and in the same direction 
D) less than   and in the same direction 
E) the same as

Question 20

According to Gauss' law for magnetism, magnetic field lines:

Accepted Answer

A) form closed loops 
B) start at south poles and end at north poles 
C) start at north poles and end at south poles 
D) start at both north and south poles and end at infinity 
E) do not exist 
A) form closed loops 
B) start at south poles and end at north poles 
C) start at north poles and end at south poles 
D) start at both north and south poles and end at infinity 
E) do not exist

Exam 32: Maxwells Equations; Magnetism of Matter

The soft iron core in the solenoid shown is removable.Then:

Displacement current exists wherever there is:

A bar magnet is broken in half.Each half is broken in half again, etc.The observation is that each piece has both a north and south pole.This is usually explained by:

What are the possible allowed values of the orbital magnetic quantum number mℓ of the electron?

The magnetic field of Earth is roughly the same as that of a magnetic dipole with a dipole moment of about:

A 1-A current is used to charge a parallel plate capacitor.A large square piece of paper is placed between the plates and parallel to them so it sticks out on all sides.The value of the integral around the perimeter of the paper is:

Two of Maxwell's equations contain a path integral on the left side and an area integral on the right.For them:

A magnetic field is applied to a diamagnetic substance.In the interior the magnetic field produced by the magnetic dipoles of the substance is:

An electron is on the z axis moving toward the xy plane but it has not reached that plane yet.At that instant:

A circular parallel-plate capacitor whose plates have a radius of 25 cm is being charged with a current of 1.3 A.What is the magnetic field 11 cm from the center of the plates?

Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic)which are used to make permanent magnets?

The magnetic field lines due to an ordinary bar magnet:

A magnetic field parallel to the x axis with a magnitude that decreases with increasing x but does not change with y and z is impossible according to:

Magnetization vectors in neighboring ferromagnetic domains are:

One of the Maxwell equations begins with ....The o symbol in the integral sign means:

Paramagnetism is closely associated with:

Of the following places one would expect that the horizontal component of the Earth's magnetic field to be largest in:

A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 *1012 V/m.s.The magnetic field at a point 1.2 m from the axis has a magnitude of:

A magnetic field is applied to a paramagnetic substance.In the interior the magnetic field produced by the magnetic dipoles of the substance is:

According to Gauss' law for magnetism, magnetic field lines:

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What are the possible allowed values of the orbital magnetic quantum number m_ℓ of the electron?

One of the Maxwell equations begins with ....The ^o symbol in the integral sign means:

A 0.70-m radius cylindrical region contains a uniform electric field that is parallel to the axis and is increasing at the rate 5.0 *10¹² V/m.s.The magnetic field at a point 1.2 m from the axis has a magnitude of: