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Q.

A solenoid has length 4 m, radius 1 mm and 400 turns of wire. If a current of 5 A is passed through this solenoid, then what is the magnetic field inside the solenoid?

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a

6.28 x 10-3T

b

6.28 x 10-6T

c

6.28 x 10-7T   

d

6.28 x 10-4T    

answer is A.

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Detailed Solution

Length of solenoid     l=0.4 cm =0.004 m

Number of turns per unit length

n=NL

n=4004=100

∴B=4π×10-7×100×5=6.28×10-4 T

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