(a) field due to an infinitely long straight charged wire-
Electric flux through Gaussian surface = flux through the curved cylindrical part of the surface
=E×2πrl
Surface includes charge λl
Where λ is the surface charge density
E×2πrl = λl / є0
E =λ/2 πє0 r
The electric field due to a long electric current carrying wire induces magnetic field around it and according to the Oersted we can calculate its value.
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