Three straight, parallel wires are coplanar and perpendicular to the plane of the page. The currents I1 and I3 are directed out of the page. If the wire 3 experiences no force due to the currents I1 and I2, then the current in the wire 2 is
A. I2 = 2I1 and directed into the page
B. I2 = 0.5I1 and directed into the page
C. I2 = 2I1 and directed out of the page
D. I2 = 0.5I1 and directed out of the page.
Answer:B
Three straight, parallel wires are coplanar and perpendicular to the plane of the page. The currents I1 and I3 are directed out of the page. If the wire 3 experiences no force due to the currents I1 and I2, then the current in the wire 2 is
A. I2 = 2I1 and directed into the page B. I2 = 0.5I1 and directed into the page C. I2 = 2I1 and directed out of the page D. I2 = 0.5I1 and directed out of the page.