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A long solenoid is formed by winding 20 ...

A long solenoid is formed by winding 20 turns `cm^-1`. What current is necessary to produce a magnetic field of 20 mT inside the solenoid?

A

8.0 A

B

4.0 A

C

2.0 A

D

1.0 A

Text Solution

Verified by Experts

The correct Answer is:
A
`B=mu_(0)nI`
`because I=(B)/(mu_0n)=(20xx10^-3xx10^7)/(4pixx20xx10^2)=8A`
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