A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible? (i) `E = 0, B = 0` (ii) `E = 0, B != 0` (iii) `E != 0, B = 0` (iv) `E != 0, B != 0`A. (i), (ii)B. (ii), (iv)C. (ii), (iii)D. (i), (ii), (iv)

A charged particle moves in a gravity-free space without change in vel

1.	A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible? (i) `E = 0, B = 0` (ii) `E = 0, B != 0` (iii) `E != 0, B = 0` (iv) `E != 0, B != 0`A. (i), (ii)B. (ii), (iv)C. (ii), (iii)D. (i), (ii), (iv)
Answer» Correct Answer - D Since velocity is constant, net force `= 0` (i) `E = 0, B = 0` i.e. `F_(e) = 0, F_(m) = 0` O.K. (ii) `E = 0, B != 0` i.e. `F_(e) = 0`, It may be that velocity is parallel or anti-parallel to magnetic field and hence `F_(m) = 0` O.K. (iii) `E != 0 , B = 0`, The electric will change magnitude or magnitude and direction or velocity, Not O.K. (iv) `E != 0, B != 0`, It may be that electric field balances magnetic force. O.K.

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A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible? (i) `E = 0, B = 0` (ii) `E = 0, B != 0` (iii) `E != 0, B = 0` (iv) `E != 0, B != 0`A. (i), (ii)B. (ii), (iv)C. (ii), (iii)D. (i), (ii), (iv)

A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible? (i) `E = 0, B = 0` (ii) `E = 0, B != 0` (iii) `E != 0, B = 0` (iv) `E != 0, B != 0`A. (i), (ii)B. (ii), (iv)C. (ii), (iii)D. (i), (ii), (iv)

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