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प्रश्न
How will you use a pith ball electroscope to find out whether the charge on a charged body is positive or negative?
उत्तर
Take a positively charged pith ball electroscope. Bring the charged body near the pith ball (without touching it). If the pith ball moves away, the body has a similar charge (positive charge) and if the pith ball moves towards the body, the body has negative charge.
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