![]() ![]() If you have a collection of charges with opposite sign then field lines will leave the +Q and land on the -Q, i.e. For a free charge in space the fields will go out to infinity. I honestly do not know how this statement related to you original question. I dont understand it, is there a way to know when will the field END or become zero OR the field is never ending(infinite)? I asked this question with my teacher and he said it depends on the charge whether or not its field line would be infinite or may END at some distance. If you had a +Q object resting on a scale in a lab, in an enclosed box, and you placed a -Q underneath the box you should see the scale read a higher value for the weight due to the +Q being pulled down by the -Q. So everyone having charged objects lying around will not necessarily cause something to happen that we can see and measure. ![]() That would potentially prevent it from moving towards (or away from) the other charge even if they were close. This charge you have would presumably be in a room, a chamber, or something solid. You also have to consider all the other forces acting on the objects. You may not see or sense the force due to it being weak. Charges an infinite distance away from each other would not affect each other. The electrostatic field does go to infinity, it is a long range force, but the strength diminishes with distance so in the limit as r -> infinity F -> 0. The strength of the attraction would be proportional to $1/r^2$ where $r$ is the distance between the charges. This would be true of a +Q on Earth and a -Q on the Moon. If you had a +Q charge in NYC and a -Q charge in Hong Kong then in theory they would attract each other. ![]() the table, the ground, whatever it is near and that will cause attraction too. In fact all charges are attracted/repelled by all other charges! Why wouldn't they be? All matter is made of charges and when you place a charge somewhere on Earth it will polarize the matter near it, e.g. You are assuming the answer is "It doesn't get attracted from other opposite charge placed somewhere else." and asking us to explain why. Q.)If we keep a charge somewhere on earth/ then why it doesnt get attracted from other opposite charge placed somewhere else in the world? Would this same argument work for space? ![]()
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