Question

Under a constant torque, the angular momentum of a body changes from $A$ to $4A$ in $4s$ . The torque is

• A. 3 A
• B. $\frac{1}{4}A$
• C. $\frac{3}{4}A$
• D. $\frac{4}{3}A$

Answer 1

Answer: (C)

Change in angular momentum $=$ Torque $\times$ time
$\Rightarrow$ Torque $=\frac{4A-A}{4}=\frac{3}{4}A$