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A solenoid of length 50 cm with 20 turns...

A solenoid of length 50 cm with 20 turns per cm and area of cross section 40 `cm^(2)` comletely surrounds another co-axial solenoid of the same length, area of cross seciton `25 cm^(2)` with 25 turns per cm. Calculate the mutual inductance of the system.

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