PhysicsHard116×since 2002Q7662A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a2\frac{a}{2}2a and 2a2 a2a from axis of the wire is :A4:14: 14:1B3:43: 43:4C1:11: 11:1D1:41: 41:4Check answerSkip