A toroid has a core of inner radius \( 25 \mathrm{~cm} \) and outer...

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A toroid has a core of inner radius \( 25 \mathrm{~cm} \) and outer radius \( 26 \mathrm{~cm} \), around which \( 3500 \) turns of a wire are wound. If the current in the wire is \( 11 \mathrm{~A} \), the magnitude of magnetic field at the centre of the core of the toroid is
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