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प्रश्न
Magnetic fields are produced by:
विकल्प
Insulating materials at rest
Static electric fields only
Moving charges (currents)
Stationary charges only
MCQ
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उत्तर
A magnetic field is produced by moving charges, i.e., electric currents. A stationary charge produces only an electrostatic field. This fundamental idea underlies both the Biot–Savart Law and Ampere's Circuital Law.
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