A uniform electric field and a uniform magnetic field exist in a region in the same direction. An electron is projected with a velocity pointed in the same direction. Then the electron will

Options

A. be deflected to the left without increase in speed
B. be deflected to the right without increase in speed
C. not be deflected but its speed will decrease
D. be deflected to the right with increase in speed

Answer

C

Explanation

As electron is moving parallel to both the fields, so magnetic force does not affect the electron.s motion. But electric force (qE) acts opposite to motion of electron. Hence, will not be deflected but its speed decreases.