ch23-p019 - 19. (a) The charge on the surface of the sphere...

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19. (a) The charge on the surface of the sphere is the product of the surface charge density σ and the surface area of the sphere (which is 2 4, r π where r is the radius). Thus, () 2 26 2 5 m 4 4 8.1 10 C/m 3.7 10 C. 2 qr −− 1.2 ⎛⎞ × = × ⎜⎟ ⎝⎠ (b) We choose a Gaussian surface in the form of a sphere, concentric with the conducting
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