A uniform electric field and a uniform magnetic field are 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

Options

A. The electron will turn to its right
B. The electron will turn to its left
C. The electron velocity will increase in magnitude
D. The electron velocity will decrease in magnitude

Answer

D

Explanation

Since is moving in parallel to the magnetic filed, hence magentic force on it `F_(m) = 0`

The only force acting on the electron is electrc force which reduces its speed.