Ampere's law provides us an easy way to calculate the magnetic field due to a symmetrical
Channel: Doubtnut
Date: 2020-07-26

Ampere's law provides us an easy way to calculate the magnetic field due to a symmetrical distribution of current. Its mathemfield expression is `ointvecB.dl=mu_0I_("in")`.  The quantity on the left hand side is known as line as integral of magnetic field over a closed Ampere's loop.  In the above question, find the magnetic field induction at a point distance r from the axis when rgta. Assume relative permeability of the medium surrounding the conductor to be unity.