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BITSAT 2009

Exam: BITSAT
Year: 2009
Subject: Physics
Chapter: Oscillations

BITSAT 2009 · Physics · Oscillations

A pendulum bob carries a +ve charge +q. A positive charge +q is...

A pendulum bob carries a +ve charge

+\mathrm{q}. \mathrm{A}

positive charge

+\mathrm{q}

is held at the point of support. Then the time period of the bob is [where,

\mathrm{L}=

length of pendulum,

\mathrm{g}_{\mathrm{eff}}=

effective value of

\mathrm{g}]

Options

Agreater than $2 \pi \sqrt{\mathrm{L} / \mathrm{g}_{\text{eff }}}$
Bless than $2 \pi \sqrt{\mathrm{L} / \mathrm{g}_{\text{eff }}}$
Cequal to $2 \pi \sqrt{\mathrm{L} / \mathrm{g}_{\text{eff }}}$
Dequal to $2 \pi \sqrt{2 \mathrm{ L} / \mathrm{g}_{\text{eff }}}$

Correct answer

A. greater than $2 \pi \sqrt{\mathrm{L} / \mathrm{g}_{\text{eff }}}$

Step-by-step solution

Effective

g^{\prime}=g-\frac{k q^{2}}{d^{2} m}, \quad T \propto \frac{1}{\sqrt{g_{\text{eff }}}}

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