A: | A body is in translational equilibrium if the net force on it is zero. |
B: | A body is in rotational equilibrium if the net torque about any point is zero. |
1. | (A) only |
2. | (B) only |
3. | both (A) and (B) |
4. | neither (A) nor (B) |
Assertion (A): | For a body under translatory as well as rotational equilibrium, net torque about any axis is zero. |
Reason (R): | \( \Sigma \vec{F}_{i}=0 \text { and } \Sigma\left(\vec{r}_{i} \times \vec{F}_{i}\right)=0 \) implies that \( \Sigma\left(\vec{r}_{i}-\overrightarrow{r_{0}}\right) \times \vec{F}=0 \). | Together
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |