1. sqrt2 T 2. T 3. 4T 4. T/4

Answer: 3. 4T Key idea: The tension supplies the centripetal force: T=mω²r . With the same m and r , T∝ω² . Doubling the speed (rpm) gives T'=(2)²T=4T . Option 3.

Topic: Dynamics of uniform circular motion: level and banked road· Laws of Motion

A bob is whirled in a horizontal plane by means of a string with an initial speed of ω rpm. The tension in the string is T. If speed becomes 2ω while keeping the same radius, the tension in the string becomes :

1. \(\sqrt2 T\)

2. \(T\)

3. \(4T\)

4. \(\frac{T}{4}\)

Doubtly Asked 30 Oct 2026 NEET UG 2024 Practice test neet Save WhatsApp Report

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Answer: 3. \(4T\)

Key idea: The tension supplies the centripetal force: \(T=m\omega^2r\).

With the same \(m\) and \(r\), \(T\propto\omega^2\). Doubling the speed (rpm) gives \(T'=(2)^2T=4T\).

Option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A bob is whirled in a horizontal plane by means of a string with an initial speed of ω rpm. The tension in the string is T. If speed becomes 2ω while keeping the same radius, the tension in the string becomes :

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