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Questions  

Which of the following is wrong statement

a
An emf can be induced between the ends of a straight conductor by moving it through a uniform magnetic field
b
The self induced emf produced by changing current in a coil always tends to decrease the current
c
Inserting an iron core in a coil increases its coefficient of self induction
d
According to Lenz's law, the direction of the induced current is such that it opposes the flux change that causes it

detailed solution

Correct option is B

ε=-Ldidt & L=μ0N2AlIf L increases then  μr also increasesμmedium>μair

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Two different coils have self-inductance  L1=8mH, L2=2mH . The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are i1,V1 and W1 respectively. Corresponding values for the second coil at the same instant are i2,V2  and W2 respectively. Then


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