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Question
A metal surface with 1 meter radius and surface charge density of 20 coulombs / m2 is enclosed in a 10 m side cube. The total outward electric displacement normal to the surface of the cube is
Options:
A .   10π coulombs.
B .   40π coulombs.
C .   none of these.
D .   80π coulombs.
Answer: Option D

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