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Introductory Physics Homework Help
Net force acting on positive charge
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[QUOTE="Marc Rindermann, post: 5853932, member: 621191"] if one ##Q## was positive, the other negative, let's just say ##Q_1## positive and ##Q_2## negative, then the force of ##Q_1## on ##P## would push ##P## to the right and the force of ##Q_2## on ##P## would pull it to the right. So both forces would act in the same direction and the net force on ##P## cannot be zero. That means the charges cannot have opposite signs. Electric force falls off with distance with ##\frac{1}{r^2}##. So if ##Q_1## is farther away from ##P## but still acts with an equal force on ##P## as ##Q_2## does then the magnitude of ##Q_1## must be greater than the magnitude of ##Q_2## to compensate for the greater distance. [/QUOTE]
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Net force acting on positive charge
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