A very long solenoid is made out of a wire with n turns per unit lengt

1.	A very long solenoid is made out of a wire with n turns per unit length. The radius of the cylinder is a and is negligible compared to its length l. The interior of the cylinder is filled with materials such that the linear magnetic permeability varies with the distance r from axis according toThe self inductance of the solenoid is(A) πn2l[μ1b2+μ2a2](B) πn2l[μ1+μ2]a2(C) πn2l [μ1b2 +μ2(a2-b2)](D)πn2 [μ1b2+(μ1+μ2)a2]
Answer» Correct option (C) πn²l [μ₁b² +μ₂(a²-b²)] Explanation: Use the formula for self inductance of the solenoid which is given as L=nΦ/l Here, n is the number of turns and Φ is the magnetic flux.

A very long solenoid is made out of a wire with n turns per unit length. The radius of the cylinder is a and is negligible compared to its length l. The interior of the cylinder is filled with materials such that the linear magnetic permeability varies with the distance r from axis according toThe self inductance of the solenoid is(A) πn2l[μ1b2+μ2a2](B) πn2l[μ1+μ2]a2(C) πn2l [μ1b2 +μ2(a2-b2)](D)πn2 [μ1b2+(μ1+μ2)a2]

Answer»

Correct option (C) πn²l [μ₁b² +μ₂(a²-b²)]

Explanation:

Use the formula for self inductance of the solenoid which is given as L=nΦ/l

Here, n is the number of turns and Φ is the magnetic flux.

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