In Fig `29-54,` two long straight wires are perpendicular to the page and separated by distance `d_(1)=0.75` cm. Wire `1` carries `6.5` A into the page. What are the (a) magnitude and (b) direction (into or out of the page ) of the current in wire `2` if the net magnetic field due to the two currents is zero at point P located at distance `d_(2)=2.50` cm from wire `2` ? If the current in wire `2` is then reversed, what are the (c ) size and (d) direction of the net field at point P ?

Answer

`(a)3.0A;(b)out;(c )32muT;` (d) net field points to the left