- #1
shikagami
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1. A charged particle moves in a straight line through a certain region of space. The magnetic field in that region
a) has a magnitude of zero
b) has a zero component perpendicular to the particle's velocity
c) has a zero component parallel to the particle's velocity
2. The north-pole end of a bar magnet is held near a stationary positively charged piece of plastic. Is the plastic
a) attracted
b) repelled
c) unaffected by the magnet
The answers are 1) either a or c, 2) c
I don't understand why. Can someone explain.
a) has a magnitude of zero
b) has a zero component perpendicular to the particle's velocity
c) has a zero component parallel to the particle's velocity
2. The north-pole end of a bar magnet is held near a stationary positively charged piece of plastic. Is the plastic
a) attracted
b) repelled
c) unaffected by the magnet
The answers are 1) either a or c, 2) c
I don't understand why. Can someone explain.