A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represents the electric fields and magnetic fields respectively, then this region of space may have:
The correct answer is (A) E = 0, B = 0.
Since the proton moves with constant velocity without changing direction or speed, no net force acts on it. Hence, both electric and magnetic fields must be zero to maintain zero acceleration.
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A proton moving with constant velocity implies no net force acts on it. The force on a proton due to electric and magnetic fields is given by:
F =q( E + v × B)
For no change in velocity,
0F =0, which is possible if:
E =0 and B =0
E =0, B ≠0
(if velocity is parallel to magnetic field)
Answer: (A) E = 0, B = 0
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