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Solution


Q.

Assertion: Galvanometer is used to measure polarity.
Reason: Galvanometer is an instrument which is used to detect current in any circuit.
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.

(2)

In testing purposes galvanometer is used to measure polarity. There is a torque acting on a current carrying coil suspended in a magnetic field which produces deflection. Deflection is directly proportional to current flowing through the galvanometer coil. Thus, both assertion and reason are correct but reason is not the correct explanation of the assertion.