Ex. 57: A needle of sewing machine moves in a path 0.06 m long and makes 20 oscillations in 1th second. What is its displacement in 20 second after passing through the centre of ite path.
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A: Here, 13 Equal charges are given we have to find force on charge Q which at center
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A: Demailed solutionisattached as image . Thank you.
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Q: Problem 2.1 (a) Twelve equal charges, q, are situated at the corners of a regular 12-sided polygon (...
A: Here, when the 13 q's is removed then force on Q is f=kqQr2
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