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The core of a toroid having 3000 turns has inner and outer radii of 11cm and 12cm respectively. The magnetic flux density in the core for a current of 0.70A is 2.5T. What is the relative permeability of the core?

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a
484
b
584
c
384
d
684

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detailed solution

Correct option is D

B=μNi2πr;μ=2πrBNiμr=μμ0=684

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