# Magnetic field problem

## Homework Statement

The XOY plane carries a uniform surface current density k=50 x^ A/m. What is the magnetic field at the point z = -0.5m?

Curl B = mu0J

## The Attempt at a Solution

using stokes theorem
Int[Curl B.ds]=Int[B.dl]= Int[mu0 J.ds`]

B. 2.pi.(.5)=50.pi.(.5)^2

i.e B=25 wb

but the answer is given 10pi.10^-6 wb.

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