Q.

Assertion: The principle of electromagnetic induction was discovered by Michael Faraday
Reason: The principle is used only in DC generators.

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)

Not only DC generators but AC generators also work on the principle of electromagnetic induction. Thus, assertion is true, but reason is false.