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Electrostatics: Charging a sphere by induction
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[QUOTE="cnh1995, post: 5676837, member: 552336"] Ground is an infinite source (supply) of charge. When the neutral sphere is grounded, ground either absorbs or supplies electrons depending on the incident field. If you took a positively charged object near the sphere, it will attract electrons on the sphere and the charges will distribute on the sphere such that the net field inside the sphere is zero. Since the incident field is from +vely charged object, electrons will be attracted from the ground on the sphere. These attracted electrons will neutralize the positive induced charges and the sphere will now have only negative induced charges. If you disconnected the sphere from the ground, the sphere will have a net negative charge. So, if the incident field is from +ve charge, electrons will flow from ground to sphere and if the incident field is from -ve charge, electroms will flow from sphere to ground. [/QUOTE]
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Electrostatics: Charging a sphere by induction
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