A circular coil of radius r carries a current i. Write the expression for the magnetic field due to this coil at its centre
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A circular coil of N turns and radius R carries a current I. It is unwound and rewound to make another coil of radius R/2, current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil. ... What is the magnitude and direction of the magnetic field due to the current 1.5 m below the .
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