Q20:Two long, parallel wires carry currents of I 1 = A and I 2 = A in the directions indicated in Figure P30.20.
(a) Find the magnitude and direction of the magnetic field at a point midway between the wires.
(b) Find the magnitude and direction of the magnetic field at point P, located d = cm above the wire carrying the current.
r =
th =
r1 =
pi =
g =
u =