A simple pendulum of length $L$ is placed between the plates of a parallel plate capacitor having electric field $E,$ as shown in figure. Its bob has mass $m$ and charge $q.$ the time period of the pendulum is given by
JEE MAIN 2019, Diffcult
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$g_{e f f}=\sqrt{g^{2}+\left(\frac{q E}{m}\right)^{2}}$
$T=2 \pi \sqrt{\frac{\ell}{g_{e f f}}}$
$2 \pi \sqrt{\frac{\ell}{\sqrt{g^{2}+\left(\frac{q E}{m}\right)^{2}}}}$
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