Question
A proton having velocity V0 passes through a region having electric field E and magnetic field B. If the velocity of proton does not change, then which of the following may be true?
(a) E = 0, B = 0
(b) E = 0, B ≠ 0
(c) E ≠ 0, B = 0
(d) E ≠ 0, B ≠ 0
Options :
a, b, c, d
a
a, b, d
a, b
Answer :
a, b, d
Solution :
Case b is correct when
Case d is correct when and
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