Question

when the charged is moving with velocity in the direction perpendicular to the uniform magnetic field, then there no change in kinetic energy even if its momentum changes .is it true?

Answer 1

Yup, of course it's true.

Answer 2

yes girl its true as we know the formula that

sin 90 degree = 0

if the charged/a alpha particle moving with certain velocity in the direction of perpendiculary to magnectic field their the change in K.E is negligible

F = BIL (sin A)

when it is perpendicular then A = 90 degree

then as per the laws of trignomentry sin 90 = 0=A

F = BIL (sin 0)

F = BIL (0)

F=0

bye..............