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A magnetizing force of 8000A/m is applied to a circular magnetic circuit of mean diameter 30cm by passing a current by a coil wound on the circuit.
If the coil is uniformly wound around the circuit and has 750 turns.
Find the current in the coil.
Can you give the condition for dispersion without deviation and illustrate colour has got the maximum angle of deviation?
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Q. Jingdan turned a screwdriver into a magnet by rubbing it with a strong bar magnet to pick up a screw that has fallen into an inaccessible spot. How could he demagnetize his
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