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Question

Electric field due to an uniformly charged ring when x tends to infinity is zero, is it possible practically?


Solution

In actual case we can not define infinity. One can not say which distance is infinite because infinity is not just a number. But for the electric field due to an uniformly charged ring equals to zero if we take the distance more than 10 to 20 times the diameter of the ring as the intensity is very less in a far distance. So we can assume that the distance of 10 to 20 times the diameter of the ring is a infinite distance for the electric field due to the ring. This is a practical phenomenon and hence that distance can be taken as infinity. But theoretically the distance where the electric field intensity will be zero can not be taken as 10 to 20 times the distance of the ring because at that distance also the calculated value or the theoretical value will not be completely equal to zero but it will indeed be a small quantity. Only the practical or experimental physics will show you that result as we have performed the experiment in real life so this is easier for me to say that its the thing as i have said

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