PhysicsMedium116×since 2002Q7672A current III flows in an infinitely long wire with cross section in the form of a semi-circular ring of radius R.R.R. The magnitude of the magnetic induction along its axis is:Aμ0I2π2R{{{\mu _0}I} \over {2{\pi ^2}R}}2π2Rμ0IBμ0I2πR{{{\mu _0}I} \over {2\pi R}}2πRμ0ICμ0I4πR{{{\mu _0}I} \over {4\pi R}}4πRμ0IDμ0Iπ2R{{{\mu _0}I} \over {{\pi ^2}R}}π2Rμ0ICheck answerSkip