Q.
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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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