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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^-4T

b

6.28 x 10^-3T

c

6.28 x 10^-7T

d

6.28 x 10^-6T

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

$n = \frac{N}{L}$

$n = \frac{400}{4} = 100$

$∴ B = 4 π \times 10^{- 7} \times 100 \times 5 = 6.28 \times 10^{- 4} T$

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