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Q.

A closely wound solenoid of length 1m has 5 layers of 500 turns each. I f the magnitude of magnetic field inside the solenoid near its centre is 4.4mT. The current carried is 

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a

1.8 A

b

1.6 A

c

1.4 A 

d

1.5 A

answer is A.

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Detailed Solution

B=μ0ni

n=NL=5×5001=2500 
B=4.4×10−3T
μ0=4π×10−7H/m
4.4×10−3=4π×10−7×2500×i
i=4.4×10−34π×10−7×2500=4.4π=1.4A

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