Question

Two parallel beams of electrons are moving with small velocities $\left(v<<c\right)$ in the same direction, then there will be

• A. a net repulsion between them
• B. a net attraction between them
• C. the electric repulsion and magnetic attraction nullify each other
• D. the electric attraction and magnetic repulsion nullify each other

Answer 1

Answer: (A)

Due to electrostatic force, there will be repulsion between electron beams. Due to magnetic interaction electron beams will attract each other as they are moving in the same direction.
As the magnitude of electrostatic repulsion is more than magnetic attraction therefore there will be a net repulsion.