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Two inductances L(1) & L(2) are connecte...

Two inductances `L_(1)` & `L_(2)` are connected in series & are seperated by a large distance.
(a) Show that their equivalent inductance is `L_(1)+L_(2)`.
(b) Why must their seperation be larger ?

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(b) `L_(eq) = sum L_(j) L_(eq)-L_(j)`, sum from j = 1 to j = N
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