JEE Main2008PhysicsElectromagnetic InductionActual
Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A=10 ~cm ^2 and length =20 ~cm . If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is ( ₀=4 10⁻⁷ Tm A ⁻¹ )
Options
- A2.4 10⁻⁵ H
- B4.8 10⁻⁴ H
- C4.8 10⁻⁵ H
- D2.4 10⁻⁴ H
Correct answer
D. 2.4 10⁻⁴ H
Step-by-step solution
M= ₀ N₁ N₂ A =2.4 10⁻⁴ H