Question

Assertion (A): The work done by the tension in the string of a simple pendulum in one complete oscillation is zero
Reason (R): No work is done by the tension in the string since tension is always at right angles to the motion of bob.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true and R is not the correct explanation of A
• C. A is true and R is false
• D. A is false and R is true

Answer 1

The correct option is A Both A and R are true and R is the correct explanation of A

As the net displacement in one complete oscillation is Zero work done is Zero. Also force is perpendicular to displacement thus work done is Zero.