Question 1

A positively charged ion, due to a cosmic ray, is headed through Earth's atmosphere toward the center of Earth.Due to Earth's magnetic field, the ion will be deflected:

Accepted Answer

A) south 
B) north 
C) west 
D) east 
E) not at all since it is a charge and not a pole

Question 2

The units of magnetization are:

Accepted Answer

A) ampere 
B) ampere.meter 
C) ampere.meter2 
D) ampere/meter 
E) ampere/meter2

Question 3

If an electron has an orbital angular momentum with magnitude L the magnitude of the orbital contribution to its magnetic dipole moment is given by:

Accepted Answer

A) eL/m 
B) eL/2m 
C) 2eL/m 
D) mL/e 
E) mL/2

Question 4

An electric field exists in the cylindrical region shown and is parallel to the cylinder axis.The magnitude of the field might vary with time according to any of the four graphs shown.Rank the four variations according to the magnitudes of the magnetic field induced at the edge of the region, least to greatest.

Accepted Answer

A) 2, 4, 3, 1 
B) 1, 3, 4, 2 
C) 4, 3, 2, 1 
D) 4, 3, 1, 2 
E) 2, 1, 3, 4

Question 5

The spin magnetic dipole moment of an electron:

Accepted Answer

A) is in the same direction as the spin angular momentum 
B) is zero 
C) has a magnitude that depends on the orbital angular momentum 
D) has a magnitude that depends on the applied magnetic field 
E) none of the above

Question 6

A cylindrical region contains a uniform electric field that is parallel to the axis and is changing with time.If r is the distance from the cylinder axis the magnitude of the magnetic field outside the region is:

Accepted Answer

A) zero 
B) proportional to 1/r 
C) proportional to r2 
D) proportional to 1/r2 
E) proportional to r

Question 7

The molecular theory of magnetism can explain each of the following EXCEPT:

Accepted Answer

A) a N pole attracts a S pole 
B) stroking an iron bar with a magnet will magnetize the bar 
C) when a bar magnet is broken in two, each piece is a bar magnet 
D) heating tends to destroy magnetization 
E) hammering tends to destroy magnetization

Exam 32: Maxwells Equations; Magnetism of Matter