An electric dipole placed withits axis in the direction of a unifrom electric field experience
Answers
Explanation:
Consider the above image. The positive charge moves in the direction of electric field and the negative charge moves opposite to the direction of electric field. The forces are equal and opposite and hence the net force is zero. This force causes the charges to move in two directions (horizontal and vertical). Since they are at an angle to the applied force (electric field ) the forces applied on the charges cause the horizontal components to cancel each other out while the vertical components remain. This causes the dipole to rotate and this rotational force add up (clockwise in this case) giving a non zero net torque.
But in this case the angle is 0. There is no rotational force since the force acting on the charges is in only one direction. In the horizontal direction the positive charge is moved in one direction and the negative charge is moved in the opposite direction, causing all the components to cancel each other giving zero net force and net torque.
I hope this is help you.....
