NEETPhysicsElectromagnetic Induction
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A square wave voltage that abruptly alternates between +5 V and -5 V is considered an alternating EMF. Reason (R): An alternating EMF must periodically and continuously change its magnitude and reverse its direction. In the light of the above statements, choose the most appropriate answer from the
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
C. (A) is correct but (R) is not correct
Step-by-step solution
The Assertion is correct because a square wave that alternates between +5 V and -5 V periodically reverses its polarity, which is the essential requirement for an alternating EMF. The Reason is incorrect because an alternating EMF does not need to change its magnitude continuously. In a square wave, the magnitude remains constant during each half-cycle and changes abruptly, yet it is still a valid alternating EMF. Answer: (A) is correct but (R) is not correct