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JIPMER 2014
Exam
JIPMER
Year
2014
Subject
Physics
Chapter
Rotational Motion

JIPMER 2014 · Physics · Rotational Motion

If applied torque on a system is zero, i.e., =0 , then for that...

If applied torque on a system is zero, i.e., τ=0\tau=0, then for that system

Options

  1. Aω=0\omega=0
  2. Bα=0\alpha=0
  3. CJ=0J=0
  4. DF=0F=0

Correct answer

B. α=0\alpha=0

Step-by-step solution

τ=lαI= moment of inertia α= angular acceleration \begin{aligned} \tau= & l \alpha \\ & I=\text{ moment of inertia } \\ & \alpha=\text{ angular acceleration }\end{aligned} If τ=0⇒lα=0 But I≠0\begin{array}{ll}\text{ If } & \tau=0 \Rightarrow l \alpha=0 \\ \text{ But } & I \neq 0\end{array} \therefore \quad \alpha=0$
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