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 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 concentric circular coils, 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 lt lt r_2 , are placed co-axially with centres coinciding. Obtain the mutual inductance of the arrangement.

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 circular coils, one of radius r and the other of radius R are placed coaxially with their centres coinciding. For Rgtgtr , obtain an expression for the mutual inductance of the arrangement.