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[" Q.3: Point charges "-q,2q,-3q,q,-q,2q...

[" Q.3: Point charges "-q,2q,-3q,q,-q,2q,-3q,q,-q,2q,],[-3q," and "q" have been placed at marks "1,2,3,4,5......12],[" respectively on the circular dial of a clock.Find the electric "],[" field intensity at the centre of the dial if distance of each "],[" charge from the centre is "r.]

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