Question

Assertion (A): When a beam is in static equilibrium, the sum of clockwise moments is equal to the sum of anticlockwise moments.

Reason (R): According to the principle of moments for a body in equilibrium, the sum of moments acting in one direction must be equal to the sum of moments in opposite direction.

Options

• both A and R are true and R is the correct explanation of A.

• both A and R are True and R is not the correct explanation of A.

• assertion is false but reason is true.

• assertion is true but reason is false.

Answer 1

Both A and R are true and R is the correct explanation of A.

Explanation:

According to the principle of moments, when a body is in equilibrium, the sum of clockwise moments is equal to the sum of anticlockwise moments about the same axis. Therefore, the beam remains in rotational equilibrium. Hence, both assertion (A) and reason (R) are true, and R correctly explains A.