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A proton moving with a constant velocity...

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

(A), (B) and (D) only

B

(A), (B) and (C) only

C

(B), (C) and (D) only

D

(A), (C) and (D) only

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The correct Answer is:
D
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