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A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20cm from the centre of the sphere is 1.5 xx 10^(3)N//C and points radially inward, what is the net charge on the sphere? |
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Answer» Solution :`R=10 cm =10 xx 10^(-2) m, r=20 cm=20 xx 10^(-2)m, E=1.5 xx 10^(3) NC^(-1)` `F_(1)=9 xx 10^(9) Q/r^(2), q=(ER^(2))/(9 xx 10^(9)) =(1.5 xx 10^(3) xx (20 xx 10^(-2))^(2))/(9 xx 10^(9)) =6.67nC` Charge q=-6.67 nC (since electric field is directed inward) |
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