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CUET

Q26. A short solenoid of radius a and n₁ number of turns per unit length and length L is kept coaxially inside a very long solenoid of radius b and n₂ number of turns per unit length. What is the mutual inductance of the system. (a) μοπb²n₁n₂L (b) μοπα²n₁n₂L² (c) μοπα²n₁n₂L (d) μοπb²n₁n₂L²