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Why test charge is always taken as point charge and its value is positive?

Asked by Krishna Prakash 23rd May 2014, 10:39 PM
Answered by Expert
A test charge is always taken inorder to study the effects of another charges or field in the vicinity.
It is taken to be a point charge so that its dimensions are small and its magnitude is small enough so that it does not create its own stong field and interact with the field to be tested.
It is taken as positive because of convention. Positive charge has field in the outward direction. It can efficiently be taken as a negative charge too. However, one has to remember that the field will then be inwards.
Answered by Expert 24th May 2014, 12:36 PM
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