Consider the the following statemetns and select the correct opiton /s from those given below the statements.
a. An electron released for rest in a uniform field always increases its kinetic energy.
b. An electron fired in the direction of a uniform electrc field always speeds up.
c. An electron fired perpendicular to a uniform electric field traverses a parabolic path.

Options

A. a,b and c are true
B. a and c are true
C. b and c are true
D. c only is true

Answer

b

Explanation

The force acting on electron in a field is opposite to the direction of the field. When it is fired perpendicular to the field, it has accelerated motion in the direction opposite to the field and uniform motion in the direction of firing, consequently it transverses a parabolic path.