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Two parallel wires carrying current in the same direction attract each other while two beams of electrons travelling in the same direction repel each other. Why?

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MODERN PUBLICATION-MOVING CHARGES AND MAGNETISM-Revision Exercises (Short Answer Questions )
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  17. State Ampere's circuital law. By using it derive an expression for mag...

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  18. (a) State the principle of working of a galvanometer. (b) Agalvanome...

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