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Question

Two coils have self-inductance L1=4 mH and L2=1 mH respectively. The currents in the two coils are increased at
the same rate. At a certain instant of time both coils are given the same power. If L1and L2are the currents in the
two coils, at that instant of time respectively, then the value of I1I2is:


A
18
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B
14
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C
12
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D
1
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Solution

The correct option is B 14
P1=ddt(12l1l21)=L1I1dI1dtP2=ddt(12L2I22)=L2I2dI2dtL1I1dI1dt=L2I2dI2dtI1I4=14

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