Question

A conducting rod is moving to the right. $\overrightarrow{B}$ is uniform & into the paper. Due to its motion, an electric field is induced in the rod. Which of the following statements is true about electric field?

• A. Electric field is in upward direction.
• B. Electric field is in downward direction.
• C. Electric field is not produced
• D. Electric field is opposite to magnetic field.

Answer 1

The correct option is B Electric field is in downward direction.

The electrons in the rod are moving towards right. By using $\overrightarrow{F}=q\overrightarrow{v}\times \overrightarrow{B}$ and right hand thumb rule, the force on the electrons is downwards. Therefore, the electrons accumulate in the bottom, and the positive charges accumulate at the top. Therefore, the field created by these induced charges is downwards.