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Who among the following suggested that a magnet must also exert an equal and opposite force on a current-carrying conductor?

Solution

✅ Correct Option: 4

After Oersted showed that a current deflects a compass needle, Ampere argued from the reciprocity of forces that the magnet must exert an equal and opposite force on the current-carrying wire. Maxwell later unified electromagnetism mathematically and Hertz demonstrated electromagnetic waves, both after Ampere's work.

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