A long straight metal rod has a very long hole of radius a drilled parallel to rod as shown in the figure. If the rod carries a current `i`. Find the magnetic field `(a)` on the axis of the rod. `(b)` on the axis of the hole.

A long straight metal rod has a very long hole of radius 'a' drilled parallel to the rod axis as shown in the figure. If the rod carries a current I , find the magnetic field on axis of hole. Given C is the centre of the hole and OC=c .

A long straight metal rod has a very long hole of radius 'a' drilled parallel to the rod axis as shown in the figure. If the rod carries a current I , find the magnetic field on axis of hole. Given C is the centre of the hole and OC=c .

If a long copper rod carries a direct current, the magnetic field associated with the current will be

If a copper rod carries a direct current, the magnetic field associated with the current will be_________

A long straight solid metal rod of radius 4cm carries a current 2A , uniformly distributed over its circular cross-section. Find the magnetic field induction at a distance 3cm from the axis of the wire.

Find the moment of inertia of the rod AB about an axis yy as shown in figure. Mass of the rod is m and length is l.