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Solution


Q.

Assertion: In an AC electric generator, a current is induced in the coil as the coil rotates between the poles of a permanent magnet.
Reason: The force due to the magnetic field makes the coil rotate in an AC electric generator.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct, but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true.  

Ans.

(3)

When the armature rotates between the poles of the magnet upon an axis perpendicular to the magnetic field, the flux which links with the armature changes continuously. Due to this, an emf is induced in the armature. This produces an electric current through the galvanometer and the slip rings and brushes and the coil moves in an AC generator in this way. Thus, assertion is true, but reason is false.