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Q.

A closely wound solenoid 80 cm long has 5 layers of windings of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A, the magnetic field near the centre of the solenoid is

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a

0.008 T 

b

0.08 T 

c

0.025 T

d

0.25 T

answer is B.

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Detailed Solution

As l>>r, we can use B=μ0nI

So, B=5×μ0nl

B=5×4π×10−7×4000.8×8=80π×10−4=0.025T

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