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A circular coil of N Turns and diameter ...

A circular coil of N Turns and diameter d carries a current I. It is unwound and rewound to make another coil of diameter `2d`, current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.

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To solve the problem, we need to calculate the magnetic moments of the original coil and the new coil, and then find the ratio of these magnetic moments. ### Step 1: Calculate the Magnetic Moment of the Original Coil 1. **Given Parameters**: - Number of turns in the original coil = \( N \) - Diameter of the original coil = \( d \) - Radius of the original coil \( r_1 = \frac{d}{2} \) - Current \( I \) ...
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