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9. (15 pts) Charge of uniform density (50.0 pC/m2) is distributed on a spherical surface (radius 2.00 h cm), and a second concentric spherical surface (radius 4.00 cm) carries a uniform charge density of 80.0 pC/m2. (a) What is the magnitude of the electric field at a point 3.00 cm from the center of the two surfaces? (b) What is the magnitude of the electrie field at a point 5,00 em from the center of the two surfaces?
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In this case field is due to the charge on inner sphere only Magnitude of electric field E = 9x109m 109 ( 50×10-12)4m(2×10-2 ) = 9 3x 10-2 = 2.513 N/C In this case field is due to both the charge on inner sphere and outer spheres Magnitude of electric field E = 9 × 1 -9x10 47150×10-12×4×10-4 +80x10-12x16x10 9x109 5x10-2)2 6.695 NiC

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