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Q.

Which of the following is wrong statement

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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

answer is B.

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Detailed Solution

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