• # question_answer A second pendulum is kept in a satellite. It is revolving around the earth at the height of 3R from the earth surface. Time period of second pendulum will be: A)  zero                B)  $2\sqrt{3}\,\sec$C)  4 sec               D)  infinity

Inside a satellite ${{g}_{eff}}=0$ $\Rightarrow$    $T=2\pi \sqrt{\frac{\ell }{{{g}_{eff}}}}=2\pi \sqrt{\frac{\ell }{0}}=\infty$