The bob of a simple pendulum is hanging vertically down from a fixed identical bob by means of a...

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The bob of a simple pendulum is hanging vertically down from a fixed identical bob by means of a string of length l . If both bobs are charged with a charge q each, time period of the pendulum is (ignore the radii of the bobs) :
a. \( 2 \pi \sqrt{\frac{l}{\mathrm{~g}+\left(\frac{\mathrm{Kq}^{2}}{l^{2} \mathrm{~m}}\right)}} \)
b. \( 2 \pi \sqrt{\frac{l}{\mathrm{~g}-\left(\frac{\mathrm{Kq}^{2}}{l^{2} \mathrm{~m}}\right)}} \)
c. \( 2 \pi \sqrt{\frac{l}{g}} \)
d. \( 2 \pi \sqrt{\frac{l}{g-\left(\frac{K q^{2}}{l m}\right)}} \)
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