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Physics · PYQ NEET UG 2024
हिन्दीA bob is whirled in a horizontal plane by means of a string with an initial speed of \( \omega\text{ rpm} \). The tension in the string is \( T \). If speed becomes \( 2\omega \) while keeping the same radius, the tension in the string becomes :
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Correct answer · Option D
\( 4T \)
Explanation
Tension provides centripetal force: \( T = m\omega^2 r \). When speed doubles to \( 2\omega \), new tension \( T' = m(2\omega)^2 r = 4 m\omega^2 r = 4T \).
