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U-Shaped Magnet

A long straig...

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A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of magnetic field at a and 2a is

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Q. A long straight wire of radius

a

carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at

a / 2

2 a

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