A particle having a charge of \( 2.0 \times 10^{-4} \mathrm{C} \) is placed directly below and a...

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A particle having a charge of \( 2.0 \times 10^{-4} \mathrm{C} \) is placed directly below and at a separation of \( 10 \mathrm{~cm} \) from the bob of a simple pendulum at rest. The mass of the bob is \( 100 \mathrm{~g} \). What charge should the bob be given so that the string becomes loose?
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