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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

2B

B

B/2

C

B

D

4B

Text Solution

Verified by Experts

The correct Answer is:
C
`B prop nIbecause (B_2)/(B_1)=(n_2)/(n_1)(I_2)/(I_1)=(2n_1)/(n_1)(I_1)/(2I_1)`
`therefore B_2=B_1=B`
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