A current of 10 A flows through a toroid that has 300 circular windings per meter measured

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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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