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

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

NTA AbhyasNTA Abhyas 2020Moving Charges and Magnetism

Solution:

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.