The core of a toroid having 3000 turns has inner and outer radii \(...

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The core of a toroid having 3000 turns has inner and outer radii \( 11 \mathrm{~cm} \) and \( 12 \mathrm{~cm} \), respectively. The magnetic field in the core for a current of \( 0.70 \mathrm{~A} \) is \( 2.5 \mathrm{~T} \). The relative permeability of the core is
(a) 685
(b) 880
(c) 448
(d) 790
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