Two concentric circular coil,s one of small radius `r_(1)` and the other of large radius `r_(2)`, such that `r_(1) lt lt r_(2)`, are placed co-axially with centres coinciding. Obtain the mutual inductance of the arrangement.

Two concentric circular coils, one of small radius r_(1) and the other of large radius r_(2) , such that r_(1)ltltr_(2) , are placed co-axially with centres coinciding. Obtain the mutual inductance of the arrangement.

Two circular coils, one of smaller radius r_(1) and the other of very large radius r_(2) are placed co-axially with centres coinciding. Obtain the mutual inductance of the arrangement.

Two circular coils, one of smaller radius r_(1) and the other of very large radius r_(2) are placed co-axially with centres coinciding. Obtain the mutual inductance of the arrangement.

(a) Explain the meaning of the term mutual inductance. Consider two concentric circular coils, one radius r_(1) and the other of radius r_(2)(r_(1) lt r_(2)) placed coaxially with centres coinciding with each other. Obtain the expression for the mutual inductance of the arrangement. (b) A rectangular coil of area A , having number of turns N is rotated at 'f' revoluation per second in a uniform magnetic field B , the field being perpendicular to the coil. Prove that maximum emf induced in the coil is 2pifNBA .