Let N1 and N2 be the total number
of turns of coils S1 and S2, respectively Rationalised 2023-24
Physics
166
When a current I2 is set up through S2, it in turn sets
up a magnetic flux through S1 Let us denote it by F1 The corresponding flux linkage with  solenoid S1 is
N1
1
M12 2
I
Φ =
(6