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The bob of a simple pendulum has a mas...

The bob of a simple pendulum has a mass of 40 g and a positive charge of `4.0 xx 10 ^(-5) C` . It makes 20 oscillations in 45 s. A vertical electric field pointing upward and of magnitude `2.5 xx 10^ 4 NC^(-1)` is switched on. How much time will it now take to complete 20 oscillations?

Text Solution

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The correct Answer is:
`100 sqrt(2) ~~ 141 s`
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