19. (a) The charge on the surface of the sphere is the product of the surface charge density σand the surface area of the sphere (which is 24,rπwhere ris the radius). Thus, ()22625m448.1 10 C/m3.7 10 C.2qr−−1.2⎛⎞=π×= ×⎜⎟⎝⎠(b) We choose a Gaussian surface in the form of a sphere, concentric with the conducting
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