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A small pith ball of mass 0.3 g is suspe...

A small pith ball of mass 0.3 g is suspended by a weightless thread between two vertical parallel plates, separated by a distance of 5 cm. The ball carries a charge of 49 esu. What potential difference should be applied between the plates so that the thread is deflected by `45^(@)` from the vertical?

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The correct Answer is:
30 esu of potential
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