Calculate the number of turns in a toroid when the charges of 8C flows in 1minute through it, produce a magnetic field of 2.5×10−4T.
[Radius of the toroid is 20cm]
A
1275
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B
1875
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C
1675
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D
2075
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Solution
The correct option is B1875 Given: B=2.5×10−4T;r=20×10−2m q=8C;t=1min=60s
So, current will be
i=qt=860=215A
The magnetic field produced by toroid inside the core of toroid is given by