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Self-inductance of a solenoid

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2026 Re-NEET 1 question

Consider a long solenoid of length l and radius r. If n is the number of turns per unit length and $\mu_0$ is the permeability of free space, the inductance of the solenoid is:

2024 Re-NEET 1 question

Let us consider two solenoids A and B, made from same magnetic material of relative permeability $\mu_r$ and equal area of cross-section. Length of A is twice that of B and the number of turns per unit length in A is half that of B. The ratio of self inductances of the two solenoids, $L_A:L_B$ is