Q.

A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E→ and B→ represent the electric and magnetic fields, respectively, then this region of space may havei  E=0,  B=0                        ii  E=0,  B≠0iii  E≠0,  B=0                       iv  E≠0,  B≠0

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a

i, ii and iii

b

ii, iii and iv

c

i, ii and iv

d

all

answer is C.

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Detailed Solution

Here the proton has no acceleration, so E = B = 0. When E = 0 but B≠0, but parallel to the motion of proton, there will be no force acting. When E≠0 and B≠0 and E, B and motion of proton (v) are mutually perpendicular, there may be no net force. Forces due to E and B cancel each other.
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A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E→ and B→ represent the electric and magnetic fields, respectively, then this region of space may havei  E=0,  B=0                        ii  E=0,  B≠0iii  E≠0,  B=0                       iv  E≠0,  B≠0