Question

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

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

Answer 1

Answer: (C)

$\frac{3}{4}A$

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