A solenoid of 2.5 m length and 2.0 c m diameter possesses 10 turns per cm. A current of 0.5 A is flowing through it. The magnetic induction at axis inside the solenoid is

Question

A solenoid of 2.5 m length and 2.0 c m diameter possesses 10 turns per cm. A current of 0.5 A is flowing through it. The magnetic induction at axis inside the solenoid is, 2 π × 10 - 4 T, 2 π × 10 - 5 T, 2 π × 10 - 6 T, 2 π × 10 - 7 T

MARKS App · Accepted Answer

The magnetic induction along the axis of solenoid B = μ o n I Where, n = number of turns per unit length and I = current ∵ μ 0 4 π = 10 - 7 T A - 1 ⇒ μ 0 = 4 π × 10 - 7 T A - 1 Given, n = 10 cm - 1 = 1000 m - 1 I = 0.5 A ∴ B = 4 π × 10 - 7 × 1000 × 0.5 = 2 π × 10 - 4 T

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