- (III) A long thin solenoid of length l and cross-sectional area A contains N, closely packed turns of wire. Wrapped tightly around it is an insulated coil of N2 turns, Fig. 21–63. Assume all the flux from coil 1 (the solenoid) passes through coil 2, and calculate the N1 N2 mutual inductance. A FIGURE 21-63 Problem 46.

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