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of the tnd Cchaige. I t 2. A thin-walled metal sphere has a radius of 20 cm and carries a charge of 6.0x10-7 C. A point charge of -3.0x107 C is placed in the centre of the sphere. Find E for a point (a) inside the sphere, (b) just outside the sphere.


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2 ㄑㄚㄑㄚˊ 凸 E-dgenclosedilo H0 L TE0

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