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Q.

A conductor is placed in a moving magnetic field (when using an AC power source) or when a conductor is constantly moving in a stationary magnetic field. What happens when the magnetic field is changed?

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a

Induces a potential difference which in turn induces an electric current

b

Induces a resistance and thereby stops the current flow

c

A potential difference is induced and eliminates the magnetic field

d

Induces an electric current and demagnetises the circuit

answer is A.

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Detailed Solution

When a conductor is placed in a moving magnetic field (when using an AC power source) or when a conductor is constantly moving in a stationary magnetic field and the magnetic field is changed, it induces a potential difference thereby inducing an electric current. 

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