First slide

Force on a charged particle moving in a magnetic field

Question

A uniform electric field and a uniform magnetic field acting along the same direction in a certain region. If an electron is projected along the direction of the fields with a certain velocity, then

Easy

A

it will turn towards left of direction of motion
B

it will turn towards right of direction of motion
C

its velocity will increase
D

its velocity will decrease

Solution

The magnetic field will not apply any force on the electron. On the other hand, the electric field will apply a force on the electron in opposite direction of the motion.
As a result, the velocity of the electron will decrease.

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