A magnetic field of is measured at a point from a very long straight wire

MATHEMATICS · Single correct · ISC · Physics · Magnetic Effects of Current and Magnetism · Ampere's circuital law

Problem

A magnetic field of 1.0×10−4 T1.0 \times 10^{-4}\,\text{T} is measured at a point 5.0 cm5.0\,\text{cm} from a very long straight wire. Determine the current in the wire. (μ0=4π×10−7 T m A−1\mu_0 = 4\pi \times 10^{-7}\,\text{T m A}^{-1}) (a) 12.5 A12.5\,\text{A} (b) 25 A25\,\text{A} (c) 2.5 A2.5\,\text{A} (d) 50 A50\,\text{A}

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