Question

An electron is moving with constant velocity along $x$ -axis. If a uniform electric field is applied along $y$ -axis, then its path in the $x-y$ plane will be :

• A. a straight line
• B. a circle
• C. a parabola
• D. an ellipse

Answer 1

The correct option is C a parabola

If a uniform electric field is applied in $y$-direction , then a force acts in the $-y$ direction for the moving electron. Thus the case is thus of a projectile and the path is a parabola.