JEE Main 2024 Physics question
A proton moving with a constant velocity passes through a region of space without any change in its velocity. If and 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 :
Answer: (C)
Solution
For constant velocity the net force on the proton must be zero. That is possible for E = 0, B = 0 (A); E = 0 with B parallel to v
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