two long, parallel lines each carry 100-A currents are 20 cm apart.
1) calculate the magnetic field at the point C that is 5 cm to the left from the left wire.
2) calculate the magnetic field at the point C that is 5 cm to the right from the left wire.
3) calculate the magnetic field at the point C that is 5 cm to the right from the right wire.
x <-------------> x
20 cm