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When a point charge of `(1)/(3)mu C` is placed on the axis of a thin disc of total charge `(2)/(3)mu C` (uniform distribution) aned radius `3.95 cm` such that distance. Between point charge and centre of disc is 1 m, then force experienced by disc is approximately :A. `4mN`B. `6mN`C. `3mN`D. `2mN` |
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Answer» Correct Answer - D Behaviour of disc is like a point charge because distance between the disc and the point charge is very large in comparison to radius of disc. `F = (9 xx 10^(9)xx (2)/(3)mu C xx (1)/(3) muC)/(1^(2))=2mN` |
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