Current I si following along the path `ABCD`, along the four edges of the cube (figure-a) creates a magnetic field in the centre at the center of the cube current I flowing along the path of the six edges `ABCDHEA` .

A current I flows along a triangle loop having sides of equal length a. The strength of magnetic field at the centre of the loop is :

A current I flows along a thin wire shaped as shown in figure. The radius of the curved part of the wire is r. The field at the centre O of the coil is:

A current I flows along a thin wire shaped as shown in figure. The radius of the curved part of the wire is r. The field at the centre O of the coil is:

A square loop of edge 'a' carries a current l. The magnetic field at the centre of loop is

The current is flowing along the path abcd of a cube (shown to the left) produces a magnetic field at the centre of cube of magnitude B . Dashed line depicts the non-conducting part of the cube. Consider a cubical shape shown to the right which is identical in size and shape to the left. If the same current now flows in along the path daefgcd, then the magnitude of magnetic field at the centre will be

A current I flows along the length of an infinitely logn, straight and thin walled pipe. Then, the magnetic field.

A current 1 flows along a triangle loop having sides of equal length a. The strength of magnetic field at the centre of the loop is :

A current 1 flows along a triangle loop having sides of equal length a. The strength of magnetic field at the centre of the loop is :

A current I flows along a thin-walled, long, half-cylinder of radius R(figure) Find the magnetic induction at a point on the axis of the cylinder