A current I flows along a round loop calculate `int_(-infty)^infty vecB.d vecr` along the axis of the loop also explain the result obtained.

Two identical equilateral triangles, insulated from each other, form a star. Length of each side of each triangle is L. A current I flows along one of the triangles in clockwies direction and along the other triangle in anti-clockwise direction. Calculate the magnetic field at the centroid of those two triangles.

A current I is flowing along an infinite, straight wire, in the positive Z-direction and the same current is flowing along a similar parallel wire 5 m apart, in the negative Z- direction. A point P is at a perpendicular distance 3 m from the first wire and 4 m from the second. What will be magnitude of the magnetic field vecB at P?

Obtain for the magnetic induction, vector at a point on the axis of a circular loop of radius r, at a distance x. If i be the current passing through the loop then draw the lines of the forces for the magnetic field.

A uniform current is flowing along the length of an infinite, straight, thin, hollow, cylinder of radius R. The magnitude field B produced at a perpendicular distance d from the axis of the cylinder is plotted in a graph. Which of the following looks like the plot?