Two long straight conductors carry currents `4 A` and` 2A` into the plane of paper. A circular path is imagined to be enclosing these currents. The value of `oint bar(B).bar(dl) is

Two long straight parallel conductors carrying currents in the opposite directions

Three long straight conductors are kept perpendicular to the plane of paper. Currents 2A,3A are passing through the two conductors into the plane of paper in first two conductors and 5A current passes through thirst conductor, directed out of the paper. A closed loop encloses the conductors, then the value of oint bar(B). bar(dl) over the closed loop is ( assume current into the paper as negative and out of the paper as positive )

There is one long straight conductor carrying current which is kept along the dimaeter of a circular loop without touching it.

Two infinitely long straight conductors carrying current in the same direction are placed parallel to each other. Then

A long straight conductor carrying a current lies along the axis of a ring. The conductor will exert a force on the ring if the ring

A long straight conductor carrying a current lies along the axis of a ring. The conductor will exert a force on the ring, if the ring

A long straight conductor carrying current I_1 is placed in the plane of a ribbon carrying current I_2 parallel to the previous one. The width of the ribbon is b and the straight conductor is at a distance a from the near endge. Find the force of attraction between the two.

A long straight conductor carrying current I_1 is placed in the plane of a ribbon carrying current I_2 parallel to the previous one. The width of the ribbon is b and the straight conductor is at a distance a from the near endge. Find the force of attraction between the two.

A stragiht conductor carrying current I_1 is passed along the axis of a circular conductor carrying current I_2 . With what fore are the currents interacting?