NEET 2010 Physics question
A particle having a mass of kg carries a charge of C. The particle is given an initial horizontal velocity of in the presence of electric field and magnetic field . To keep the particle moving in a horizontal direction, it is necessary that (i) should be perpendicular to the direction of velocity and should be along the direction of velocity (ii) Both and should be along the direction of velocity (iii) Both and are mutually perpendicular and perpendicular to the direction of velocity (iv) should be along the direction of velocity and should be perpendicular to the direction of velocity Which one of the following pairs of statements is possible
Solution
The force on the charge is . The particle keeps moving along its original (horizontal) line only if there is no net force perpendicular to (a force along merely changes the speed). Gravity is neglected here, as the electromagnetic forces are the ones
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