JEE Main 2022 · 26 Jun · Shift 2 · Physics Q43

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PhysicsSingle correct+4 / -1Question 43 of 90

Two coils of self inductance $L_1$ and $L_2$ are connected in series combination having mutual inductance of the coils as M. The equivalent self inductance of the combination will be :

Two coils in series; current I enters the first coil from the left and the second coil's winding is drawn with the current I arrows indicating the coils are connected in opposition.

\dfrac1{L_1}+\dfrac1{L_2}+\dfrac1M

L_1+L_2+M

L_1+L_2+2M

L_1+L_2-2M

Answer and worked solution

Official answer: D

Series in opposition (as drawn, the fluxes oppose): $L=L_1+L_2-2M$ .

(D)

Topics:Mutual inductance Self inductance

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JEE Main 2022 · 26 Jun · Shift 2, Physics question 43