Physics

Problem

Two long parallel wires are

8\,\text{cm}

apart and carry currents of

20\,\text{A}

in opposite directions. Find the magnitude of the magnetic field at the point that lies midway between the wires. a)

1.0 \times 10^{-4}\,\text{T}

4.0 \times 10^{-4}\,\text{T}

2.0 \times 10^{-4}\,\text{T}

5.0 \times 10^{-5}\,\text{T}