Two tiny wire loops, with areas a1 and a2, are situated a displacement apart (Fig. 7.41).

Two tiny wire loops, with areas a1 and a2, are situated a displacement π apart (Fig. 7.41).

(a) Find their mutual inductance.

(b) Suppose a current I1 is flowing in loop 1, and we propose to turn on a current I2 in loop 2. How much work must be done, against the mutually induced emf, to keep the current I1 flowing in loop 1 ? In light of this result, comment on Eq. 6.35.

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