when polarity is given?
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Explanation:
A) when bar magnet is moved quickly towards the solenoid then due to change in magnetic field a current is induced and the needle of the galvanometer deflects quickly.
B) when the solenoid is moved quickly towards the bar magnet the needle of the galvanometer deflects quickly.
C) when bar magnet is kept steadily inside the solenoid the there is no the magnetic field of the solenoid or the bar magnet hence .
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