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Two solenoid coils, A and B, are entangled with equal lengths of the same type of...

Two solenoid coils, A and B, are entangled with equal lengths of the same type of wire. The length of the axis of each coil is large compared to its diameter. The axial length of coil A is double that of B, and coil A has twice as many turns as coil B. What is the ratio of the inductance of coil A to that of coil B?

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