Equal currents of magnitude I travel out of the page in wires M and N.Eight directions are indicated by letters A through H. The direction of the magnetic field at point P is
A)E.
B)F.
C)G.
D)H.
E)A.

Question

Equal currents of magnitude I travel out of the page in wires M and N.Eight directions are indicated by letters A through H.  The direction of the magnetic field at point P is
A)E. 
B)F. 
C)G. 
D)H. 
E)A.

Quizplus · Accepted Answer

Using the right-hand rule, if you wrap your fingers in the direction of the current in wire M, your thumb points towards the left. Similarly, if you wrap your fingers in the direction of the current in wire N, your thumb points towards the right. The magnetic field induced by these currents points out of the page between the wires and into the page outside of the wires. At point P, which is below wire N and to the left of wire M, the magnetic field is directed towards the right, which is in the direction of answer choice E.

Equal Currents of Magnitude I Travel Out of the Page