a solenoid of length 50 cm with 20 turns per cm and area of cross section 40 cm2 completely surrounds another coaxial solenoid of the same length , area of cross section 25 cm2 with 25 turns per cm . calculate the mutual inductance of the system ?
here, l=50 cm=0.05m
N1=20 ,N2=25 ,A1=40 cm2 ,A2=25cm2
now
we know, M1=4*3.14*10-7N1 N2A1 l & M2=4*3.14*10-7N1N2A2l
therefore ,add both M1 & M2
NOW, find Mtotal and we will get answer
i think you will better understand it !!!!!!!!!!!!!!