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A conducting sphere of radius 10 cm has an unknown charge if the electricfield 20 cm from the centre of the sphere is 1.5 xx10^(3)N/Cand pointsradialy inward whatis the net charge on the sphere |
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Answer» Solution :Electric field at a point OUTSIDE the charged sphere of radius R is, `E_(0) = (kq)/(r^(2))` (where `r gt R`) `therefore q = (E_(0) xx r^(2))/(K)` `=(-1.5 xx 10^(3) xx (0.2)^(2))/(9 xx 10^(9))` `therefore q = -6.667 xx 10^(-9)` C (Here `E_(0)`point is radially inward and so it is taken as negative) |
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