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A charge Q exerts a 9.18 N force on another charge q. If the distance between...

A charge Q exerts a 9.18 N force on another charge q. If the distance between the charges is tripled, what is the magnitude of the force exerted on Q by q?

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Answer #1

Electric force between two charge particles having charge ' q ' and ' Q ' and separated by a distance ' r ' is given by

Where,

  

Given, F = 9.18 N

Now, if we change the separation between the charges from ' r ' to ' 3r ' , then the new force between the charges will be

  

Hence, if the distance between charges is tripled then the magnitude of the force exerted on Q by q will be 1.02 N .

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