A toroid of core of inner radius \( 0.25 \mathrm{~m} \) and outer r...

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A toroid of core of inner radius \( 0.25 \mathrm{~m} \) and outer radius \( 0.26 \mathrm{~m} \) around which 3500 turns of a wire are wound. If the current in the wire is \( 11 \mathrm{~A} \), then magnetic field inside the core of the toroid is
(a) \( 3 \times 10^{2} \mathrm{~T} \)
(b) \( 3 \times 10^{-2} \mathrm{~T} \) (c) \( 3 \times 10^{-7} \mathrm{~T} \) (d) \( 3 \times 10^{7} \mathrm{~T} \)
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