Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area A=10 cm² and length =20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is (μ₀=4πx10⁻⁷ T mA⁻¹)

Options

(a) 2.4πx10⁻⁴ H
(b) 2.4πx10⁻⁵ H
(c) 4.8πx10⁻⁴ H
(d) 4.8πx10⁻⁵ H

Correct Answer:

2.4πx10⁻⁴ H

Explanation:

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