Physics · 2019
JEE Main · 12 January 2019, Shift 2 · Q2
Two particles A, B are moving on two concentric circles of radii R_1 and R_2 with equal angular speed ω. At t =0, their positions and direction of…
Two particles A, B are moving on two concentric circles of radii $\displaystyle \mathrm{R}_1$ and $\displaystyle \mathrm{R}_2$ with equal angular speed $\displaystyle \omega$. At $\displaystyle \mathrm{t}=0$, their positions and direction of motion are shown in the figure :
The relative velocity $\displaystyle \overrightarrow{v_{\mathrm{A}}}-\overrightarrow{v_B}$ at $\displaystyle \mathrm{t}=\frac{\pi}{2 \omega}$ is given by :
The relative velocity $\displaystyle \overrightarrow{v_{\mathrm{A}}}-\overrightarrow{v_B}$ at $\displaystyle \mathrm{t}=\frac{\pi}{2 \omega}$ is given by :Official answer
(2)
$\displaystyle \omega\left(\mathrm{R}_2-\mathrm{R}_1\right) \hat{i}$
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.