Question: A current of 10 A flows through a toroid that has 300 circular windings per meter measured along the interior edge of the windings. The

A current of 10 A flows through a toroid that has 300 circular windings per meter measured along the interior edge of the windings. The radius of each circular winding is $20 \mathrm{~cm}$, and the inner radius of the toroid is $40 \mathrm{~cm}$. Find the magnitude of the magnetic field at $30 \mathrm{~cm}$ inside the circular winding.

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