The current in the windings on a toroid is `2.0A`. There are 400 turns and the mean circumferential length is `40cm`. If the inside magnetic field is
The current in the windings on a toroid is `2.0A`. There are 400 turns and the mean circumferential length is `40cm`. If the inside magnetic field is `1.0T,` the relative permeability is near to
A. 100
B. 200
C. 300
D. 400
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Correct Answer - D
Magnetic field `B=(mu_(0)mu_(r )Ni)/(2pi r)`
`1=(4pi xx10^(-7)xxmu_(r )xx400xx2)/(40xx10^(-2))`
`mu_(r )=400`
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