Question

A proton is moving in a uniform magnetic field what will be the path of the proton. [3] If its initial direction is- (a) (i) Parallel to the field.

Answer 1

The path of the proton if its initial direction is parallel to the field is a straight line

• We know that force on a charged particle is given by the formula,

$F = q(v×B)$

$F = qvBsin \alpha$

• When $\alpha = 0$ i.e angle between velocity and magnetic field is 0

• sin$\alpha = 0$

F = 0

i.e Force acting on the particle is zero, so it will follow straight line