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Q. what must be the charge of a particle of mass 2g for it to be stationary in the laboratory when placed in an electric field of 500N/C?

Q. Show that Gauss' law is satisfied for the magnetic field due to a straight wire that carries a current I in the +z - direction for a volume that represents a portion of a cylindrical shell of height h, extending from a radius r to a radius R and formed by an angle?

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