Question:medium
A pendulum having a negatively charged metal knob is oscillating on a positively charged surface. The time of the pendulum will be:
A pendulum having a negatively charged metal knob is oscillating on a positively charged surface. The time of the pendulum will be:
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External forces, such as electric or magnetic forces, can alter the oscillation characteristics of a pendulum.
Updated On: Jan 13, 2026
- Increase
- Decrease
- Will remain the same
- Will increase and then decrease
Show Solution
The Correct Option is B
Solution and Explanation
Oscillation of a charged pendulum over a charged surface results in an increased effective restoring force due to attraction between opposite charges. This causes:
\begin{itemize}
\item An amplified restoring force, leading to a higher angular frequency ($ \omega = \sqrt{\frac{g}{L}} $),
\item A reduced time period ($ T = \frac{2\pi}{\omega} $).
\end{itemize}
Consequently, the pendulum's oscillation accelerates, shortening its time period.
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