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. it will turn towards left of direction of motion
B. it will turn towards right of direacton of motion
C. its velocity will increase
D. its velocity will decrease

Answer

D

Explanation

The magnetic field will not exert any force on the electron because the electron is projected along the direction of the magnetic field. But as the electron is negatively charged, its motion will get retarded by the electric field and its velocity will decreases.