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 have
(1) 
(2) 
(3) 
(4) 
Text Solution
Verified by ExpertsThe correct answer is:
D
If both 
and 
are zero, then 
and 
both are zero.
Hence, velocity may remain constant. If 
but velocity is parallel or antiparallel to magnetic field, then 
and 
both are zero. If 
but 
, then also velocity may remain constant.
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