If infinity does not exist then why do we even calculate according to it?

Asked by prasadagni | 27th Apr, 2017, 10:57: AM

Expert Answer:

We use infinity for calculations because the range of any physical force like electromagnetic force or gravitational force is infinite. So, in Physics infinity does not mean actual infinity (∞). It means a very large distance where the effect of the force or electric field is zero. Hence, if we have an infinity for reference then we know that for the difference between two points, one point will have value as zero and the answer we get will be pertaining to the point of consideration itself.
 
To put it in Physics perspective, we consider infinity so that we get a standard reference point for which we know the value is zero, i.e. electric field or potential will be zero at infinity.

Answered by Romal Bhansali | 27th Apr, 2017, 01:27: PM

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