Each of the current carrying wires is infinitely long andstraightand carries a current either into or out of the page asshown.
a) what is the direction of the net magnetic field produced bythesefour wires at the center of the square? (Draw arrowsindicating thedirection of B1, B2, B3 and B4 at the center) (Drawan arrowindicating the direction and magnitude of the netmagneticfield)
b) what is the direction of the net magnetic field produced bythesefour wires at the center of the square, if the direction ofthecurrents in wires 3 and 4 are reversed?
