A uniform electric field and a uniform magneitc field exist in a region in the same direction An electron is projected with velocity pointed in the same direction 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 diflected but its speed will decrease
D. not be deflected but its speed will increase

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, electron will not be deflected but its speed decreases.