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OCW Scholar - Physics II: Electricity and Magnetism 14 Online
OpenStudy (anonymous):

Magnetic field due to current can affects a compass. If we use alternating or direct current, explain how magnetic field will differ for both cases. Explain the relationship between dictance and magnetic field strength.

OpenStudy (anonymous):

the difference will just be ,in case of alternating current the magnetic field is time varying.. the rest of the formula(dependent on distance) will remain same

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