If there is a change of angular momentum from 1J-s to 4J-s in 4 second, then the torque is

If there is a change of angular momentum from 1J-s to 4J-s in 4 second, then the torque is
  1. $1 \mathrm{~J}$
  2. $\left(\frac{3}{4}\right) \mathrm{J}$
  3. $\left(\frac{5}{4}\right) \mathrm{J}$
  4. $\left(\frac{4}{3}\right) \mathrm{J}$

Solution

$\mathrm{L}_{1}=1 \mathrm{~J} \mathrm{~s} \quad \mathrm{~L}_{2}=4 \mathrm{~J} \mathrm{~s}$ $\mathrm{t}=4$ $\tau=\frac{4-1}{4}=\frac{3}{4} \mathrm{~J}$ .

Asked in: MHT CET 2020 (16 Oct Shift 1)

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