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A solenoid has 20 turns per cm. What is ...

A solenoid has 20 turns per cm. What is the value of the current that should be passed through the solenoid, to produce a magnetic field of 4 mT at its center?

A

`4/piA`

B

`5/piA`

C

`6/piA`

D

`8/piA`

Text Solution

Verified by Experts

The correct Answer is:
B
`B=mu_0nI,n=2000 turns/m therefore1=B/(mu_0n)=(4 xx 10^(-3))/(4pi xx 10^(-7) xx 2 xx 10^(3))=5/piA`
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