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A thin spherical metal shell of radius 8.0 cm carries 7.5 µC of excess charge. What...

A thin spherical metal shell of radius 8.0 cm carries 7.5 µC of excess charge. What is the magnitude of the electric field it produces at the following places? (k = 1/4 0 = 9.0 × 109 N  m2/C2)
(a) at 1.0 cm above the surface
(b) at 7.0 cm from the center of the sphere

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