Assertion: Two very fast moving electron beams in same direction attract each other.
Reason: Magnetic force dominates the electrostatic repulsion at very high speed.
Text Solution
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When two beams of electrons move in the same direction, the magnetic force of attraction between them becomes stronger than the electrostatic force of repulsion at high speeds. This causes the beams to converge.
If the beams were stationary, they would repel each other because negative charges repel. However, when the beams move, magnetic effects are created that reduce the repulsion.
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