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The magnetic field inside a current carr...

The magnetic field inside a current carrying toroidal solenoid is 0.1 mT. What is the magnetic field inside the toroid If the current through it is doubled and its radius is made half?

A

`0.2 mT`

B

`0.1 mT`

C

`0.3 mT`

D

`0.05 mT`

Text Solution

Verified by Experts

The correct Answer is:
A
`B=mu_0nI`. It does not depend upon r. It is doubled if I is doubled. `therefore B'=0.2 mT`.
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