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Aha! so you didn't find it! Well, don't get all jinxed up, its something not many students not preparing for higher competitive exams know. I can give you a whole proof , but I'm not sure if it'll be... link 2 years ago
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This concept was discussed while explaining the proof of Electrostatic Pressure.
In this question, in the earlier case, when the circular loop is intact the net Electric field at the center is... link 2 years ago