Two thin concentric wires shpaed as circles with radii `a` and `b` lie in the same plane. Allowing for `a lt lt b`, find:
(a) their mutual inductane,
(b) the magnetic flux through the surface enclosed by the outside wire, when the inside wire carries a current `I`.

A long copper wire carries a current of 10 ampere . Calculate the magnetic flux per metre of the wire for a plane surface S inside the wire as shown in the figure.

A long copper wire carries a current of 10 ampere . Calculate the magnetic flux per metre of the wire for a plane surface S inside the wire as shown in the figure.

A long copper wire carries a current of I ampere. Calculate the magnetic flux per meter of the wire for a plane surface S inside the wire as shown in Fig.

A long copper wire carries a current of I ampere. Calculate the magnetic flux per meter of the wire for a plane surface S inside the wire as shown in Fig.

A rigid wire consists of a semicircular portion of radius R and two straight sections the wire is partially immersed in a perpendicualr magnetic field B as shown in the figure. Find the magnetic force on the wire if it carries a current i .

A rigid wire consists of a semicircular portion of radius R and two straight sections the wire is partially immersed in a perpendicualr magnetic field B as shown in the figure. Find the magnetic force on the wire if it carries a current i .

A rigid wire consists of a semicircular portion of radius R and two straight sections the wire is partially immersed in a perpendicualr magnetic field B as shown in the figure. Find the magnetic force on the wire if it carries a current i .

Two long straight parallel wieres are 2m apart, perpendicular to the plane of the paper. The wire A carries a current of 9.6 A , directed into the plane of the paper. The wire B carries a current such that the magnetic field of induction at the point P , at a distance of 10/11 m from the wire B, is zero. find a. the magnitude and directiion of the current in B. b. the magnitude of the magnetic field of induction of the pont S . c. the force per unit length on the wire B .

Two long straight parallel wieres are 2m apart, perpendicular to the plane of the paper. The wire A carries a current of 9.6 A , directed into the plane of the paper. The wire B carries a current such that the magnetic field of induction at the point P , at a distance of 10/11 m from the wire B, is zero. find a. the magnitude and directiion of the current in B. b. the magnitude of the magnetic field of induction of the pont S . c. the force per unit length on the wire B .