The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is
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a
2 henry
b
3 henry
c
4 henry
d
5 henry
answer is A.
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Detailed Solution
LS=L1+L2=10H .............(i)LP=L1L2L1+L2=2.4H ..........(ii)On solving (i) and (ii) L1L2 = 24 …....... (iii) Also L1−L22=L1+L22−4L1L2⇒L1−L22=(10)2−4×24=4⇒L1−L2=2H
The equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is