First slide

Force on a charged particle moving in a magnetic field

Question

An electron moving with a speed u along the positive x-axis at y = 0 enters a region of uniform magnetic field which exists to the right of y-axis. The electron exits from the region after some time with the speed v at coordinate y, then

Easy

A

$v > u, y < 0$
B

$v = u, y > 0$
C

$v > u, y > 0$
D

$v = u, y < 0$

Solution

Magnetic force does not change the speed of charged particle.
Hence, v = u. Further magnetic field on the electron in the given condition is along negative y-axis in the starting. Or it describes a circular path in clockwise direction. Hence, when it exits from the field, y < 0

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