A semicircular wire of radius lies flat on a table
PHYSICS · Single correct · CBSE · Physics · Magnetic Effects of Electric Current · Magnetic Effects of Electric Current
Problem
A semicircular wire of radius R lies flat on a table. Two straight leads connect the ends of the semicircle directly to its center, forming a closed path. A constant current I leaves the center along one radial lead, travels around the semicircle in the clockwise direction as seen from above, and returns along the other radial lead. Neglect any magnetic field produced by the radial leads at the center. Which statement best describes the direction of the magnetic field at the center due only to the current in the semicircular portion?
(a) Vertically upward, out of the table
(b) Radially outward in the plane of the table
(c) Vertically downward, into the table
(d) The magnetic field at the center is zero