Question

A body is acted upon by a constant torque . In 4 seconds its angular momentum changes from L to 4L . The magnitude of the torque is
A. `(L)/(4)`
B. `(3L)/(4)`
C. 3L
D. 12L

Answer 1

Correct Answer - B
`tau = (dl)/(dt)=(L_(2)-L_(1))/(dt)=(4L-L)/(4)=(3)/(4)L`.