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

The bob of a simple pendulum has a mass of 60 g and a positive charge of `6xx10^(-6) C`. It makes 30 oscillations in 50 s above earth's surface. A vertical electric field pointing upward and of magnitude `5xx10^(4) N//C` is switched on. How much time will it now take to complete 60 oscillations ? `(g=10 m//s^(2))`

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