Both B and E should be along the direction of velocity and both B and E are mutually perpendicular and perpendicular to the direction of velocity.
A particle having a mass of 10−2 kg carries a charge of 5×10−8C. The particle is given an initial horizontal velocity of 105 ms−1 in the presence of electric field E and magnetic field B. To keep the particle moving in a horizontal direction, it is necessary that (1) B should be perpendicular to the direction of velocity and E should be along the direction of velocity. (2) Both B and E should be along the direction of velocity. (3) Both B and E are mutually perpendicular and perpendicular to the direction of velocity. (4) B should be along the direction of velocity and E should be perpendicular to the direction of velocity. Which one of the following pairs of statements is possible?
Held on 30 Apr 2010 · Verified 9 Jul 2026.
(1) and (3)
(3) and (4)
(2) and (3)
(2) and (4)
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