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A closely wound solenoid of 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 A, then the magnitude of the magnetic field inside the solenoid near its centre is approximately

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$1.5 \times 10^{- 2} T$

$2.5 \times 10^{- 2} T$

$3.5 \times 10^{- 2} T$

$4.5 \times 10^{- 2} T$

answer is B.

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