Motion of a moving electron is not affected by

Options

A. An electric field applied in the direction of motion
B. Magnetic field applied in the direction of motion
C. Electric field applied perpendicular to the direction of motion
D. Magnetic field applied perpendicular to the direction of motion

Answer

B

Explanation

When `vecv || vecB (theta = 0^(@))` , then `vecF_(m) = q(vecv xx vecB) implies F_(m) = qv B sin theta = qvB (0) = 0`