Currents in the heart. The body contains many small currents caused by the motion of ions in the organs and cells. Measurements of the magnetic field around the chest due to currents in the heart give values of about 1.0 μG. Although the actual currents are rather complicated, we can gain a rough understanding of their magnitude if we model them as a long wire.
Find the magnitude and direction of the magnetic field at:
(a) point P1, midway between the wires,
(b) point P2, 25.0 cm to the right of P1.