5/ A 6.0 cm long copper wire has a mass of 5.04 g and is carrying a current of 14.10 A perpendicular to a uniform magnetic field. This apparatus is placed in a strong magnetic field and the wire is suspended motionless in the air. The strength of the magnetic field is _________ T.

Select one:

a.0.58

b.0.21

c.0.058

d.0.0021

7/ A charged particle experiences a force of 4.62 N when it passes through a magnetic field. If the same particle were sent at exactly half its previous speed through a magnetic field exactly four times as strong, the particle would experience a force of _______ N.

Select one:

a.13.9 N

b.6.93 N

c.18.5 N

d.9.24 N

Question 8

A magnetic field exerts no force on

Select one:

a.a magnet

b.an iron bar

c.an electric current

d.a stationary electric charge