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A long solenoid carrying a current prod...

A long solenoid carrying a current produces a magnetic field `B` along its axis. If the current is doubled and the number of turns per cm is halved, the new vlaue of the magnetic field is

A

`B`

B

`2B`

C

`4B`

D

`B//2`

Text Solution

Verified by Experts

The correct Answer is:
D
`B=mu_(0)ni`
`B'=mu_(0)(n/2)(2i)=B`
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