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average radius of toroid

Average radius of toroid made on ring of non-magnetic material is 0 .1m & it has 500 turns. If it carries 0.5A current, then the magnetic field produced along its circular axis inside the toroid will be
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If average radius of toroid made on ring of non-magnetic material is 0 .1m & it has 500 turns and carries 0.5A current, then the magnetic field produced along its circular axis inside the toroid will be:

B=\frac{\mu_0 Ni}{2\pi r}

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