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Q.

A closely wound solenoid 80 cm long has 5 layers of winding of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current is 8.0 A, the magnitude of B→ inside the solenoid near its centre will be:

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a

4π×10−3 T

b

3π×10−3 T

c

8π×10−3 T

d

6π×10−3 T

answer is A.

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Detailed Solution

n=Total turnLength

n=20000.80

B=μ∘n1

=4π×10−7×2000×8.00.80

B=8π×10−3T

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