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निर्यात् में रखे दो बिन्दुवत आवेशों के मध्य बल 18 N है यदि 1 mm मोटाई तथा 6 परावैद्युतांक की एक कांच की पट्टिका इन आवेशों के मध्य रख दी जाये तब बल का मान ज्ञात कीजिए। 

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दिया है; F = 18 N

εr = 6

Fm\(\frac{F}{\varepsilon_r} = \frac{18}{6}\) = 3N

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