Physics - Magnetism Question with Solution | TestHub

A long straight wire carrying a current of$30\mathrm{ }\mathrm{A}$is placed in an external uniform magnetic field of induction$4\times {10}^{–4}\mathrm{ }\mathrm{T}$. The direction of external magnetic field is along the direction of the current. The magnitude of the resultant magnetic induction at a point$2.0\mathrm{ }\mathrm{c}\mathrm{m}$away from the wire is$n\times {10}^{-4} \mathrm{T}$. What is the value of$n$?