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Consider a spherical Gaussian surface and three charges:q1=1.76microC, q2= -2.50microC, and q3=3.69microC. Find the electric flux through the Gaussian surface if it completely encloses

(a) only chargeq1 & q2

(b) only chargesq2 and q3, and

(c) all three charges. Suppose a 4th charge, Q, is added to part C. Find sign and magnitude of Q required to give zero electric flux through the surface.

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