Here's a diagram that comes with the question.
http://i844.photobucket.com/albums/ab3/pusscake89/Q3.jpg
Two long straight wires are parallel and carry current in opposite
directions (as shown in the figure to the right). The currents are
10 Amps and 15 Amps and the wires are separated by 0.40 cm.
What is the magnetic field (magnitude and direction) due these
currents at a point midway between the wires?
http://i844.photobucket.com/albums/ab3/pusscake89/Q3.jpg
Two long straight wires are parallel and carry current in opposite
directions (as shown in the figure to the right). The currents are
10 Amps and 15 Amps and the wires are separated by 0.40 cm.
What is the magnetic field (magnitude and direction) due these
currents at a point midway between the wires?