Magnetic field `vecB` is produced by a current. On the basis of this concept, Maxwell explained the existence of EM. Magnetic field is generally directed towards circumference of circular loop and ris the radius whose plane is perpendicular to direction of current carrying wire, which is centered symmetrically with respect to the wire

Conduction of current due to:

Options

A. Current through conductor
B. Current through loop
C. Current on surface
D. Current between capacitor