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A toroid with mean radius r(0), diameter...

A toroid with mean radius `r_(0)`, diameter `2a` have N turns carrying current l. What is the magnetic field B inside the the toroid?

A

`(NI)/(2pir_(0))`

B

`(Nl)/(2pi(r_(0)+a))`

C

`(Nl)/(pi(r_(0)+a))`

D

zero

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