A proton moving with a constant velocity passes through a region of space without any changing its velocity. If `E` and `B` represent the electric and magnetic fields, respectively. Then, this region of space may have
A
`E=0,B=0`
B
`E=0, B!=0`
C
`E!=0,B=0`
D
`E!=0,B!=0`
Text Solution
Verified by Experts
The correct Answer is:
D
If both `E` and `B` are zero, the `F_e ` and `F_m` bothare zero,. Hence, velocity may remain constant. Therefore, option a is correct. If `E=0, B!=0` but velocity is parallel or antiparallel to magnetic field, then also `F_e` and `F_m` both are zero. Hence, option b, is also correct. If `E!=0, B!=0 but F_e+F_m=0` then again velocity may remain constant or option d is also correct.
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