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JEE Main & Advanced Physics Two Dimensional Motion Question Bank Uniform Circular Motion

  • question_answer
    A particle moves in a circular orbit under the action of a central attractive force inversely proportional to the distance \['r'\]. The speed of the particle is                     [CBSE PMT 1995]

    A)             Proportional to \[{{r}^{2}}\]           

    B)             Independent of \[r\]

    C)             Proportional to \[r\]     

    D)             Proportional to \[1/r\]

    Correct Answer: B

    Solution :

        \[\frac{m{{v}^{2}}}{r}\propto \frac{K}{r}\Rightarrow \upsilon \propto r{}^\circ \]             i.e. speed of the particle is independent of r.


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