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# Two induction coil of inductance $L_1$ and $L_2$ are separated by a considerable distance. On connectivity them in series the equivalent inductance is

$(a)\;L_1L_2 \\(b)\;L_1+L_2 \\ (c)\;L_1-L_2 \\ (d)\;\sqrt {L_1L_2}$

Two inductance in series will have effective inductance $L_1+L_2$
Hence b is the correct answer.