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JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Laws of Motion

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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: An electric fan continues to rotate for some time after the current is switched off.
Reason R: Fan continuous to rotate due to inertia of motion.
In the light of above statements, choose the most appropriate answer from the options given below.
  1. (A) is correct but is not correct.
  2. (B)Both and are correct and is the correct explanation of .✓ Correct
  3. (C) is not correct but is correct.
  4. (D)Both and are correct but is NOT the correct explanation of .

Answer: (B)

Solution

Assertion A is correct: an electric fan does continue to rotate after the current is switched off. Reason R is also correct and provides the correct explanation: the fan blades possess rotational inertia (moment of inertia), and by Newton's first law (inertia of motion), they continue rotating until friction and air resistance bring them to rest. Both A and R are correct, and R correctly explains A.

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option

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