A sensitive IC (integrated circuit) on a circuit board is located 1m from a long power line carrying 10A. The power line generates a magnetic field. You can place a trace on a circuit board with current running parallel to the power line to cancel out the magnetic field at the position of the IC, but this trace can only carry 100mA, because higher currents would cause heating problems. What is the maximum distance the trace can be from the IC? (hint, use infinite wires approximation for mag field)