Question

The time period of a simple pendulum at the centre of earth is:

• A. $0$
• B. $\infty$
• C. Less than $0$
• D. $none$

Answer 1

The correct option is B $\infty$

Time period of simple pendulum, $T=2\pi \sqrt{\frac{L}{g}}$

at the center of earth, $g=0$

$\therefore$ at the center of earth, $T=2\pi \sqrt{\frac{L}{0}}$

$=\infty$