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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 G and B G represent the electric and magnetic fields respectively, then the 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 Choose the most appropriate answer from the options given below :

1. (A), (C) and (D) only
2. (A), (B) and (C) only
3. (A), (B) and (D) only
4. (B), (C) and (D) only

Correct answer: (A), (B) and (D) only

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