A toroid is wound over a circular core. Radius of each turn is `r` and radius of toroid is `R (gt gt r)`. The coefficient of self-inductance of the toroid is given by

A toroid is wound over a circular core. Radius of each turn is r and radius of toroid is R(>>r). The Coefficient of self - inductance of the toroid is given by

A circular coil of radius 5 cm has 500 turns of a wire. The approximate value of the coefficient of self-induction of the coil will be

A coil of radius r is placed at the centre of R>>r and coils are in same plane.The coefficient of mutual inductance between the coil is

[" A small circular coil of radius " "r" and having "n' turns carries a current "7" .The coefficient of self-induction of the coil is "],[[" (A) "mu_(0)pi nr/2],[" (B) ",mu_(0)pi nr],[" (C) ",mu_(o)pi n^(2)r/2],[" (D) ",mu_(o)pi nr^(2)/2]]

A toroidal solenoid with an air core has an average radius of 15 cm, area of cross-section 12 cm^(2) and 1200 turns. Obtain the self inductance of the toroid. Ignore field variations across the cross-section of the toroid. (b) A second coil of 300 turns is wound closely on the toroid above. If the current in the primary coil is increased from zero to 2.0 A in 0.05 s, obtain the induced e.m.f. in the second coil.

Two concentric circular coils of radius r and R are placed coaxially with centres coinciding If R gt gt r then calculate the mutual inductance the coils.

A toroid of 1000 turns has an average radius of 10 cm and area of cross section 15 cm^(2) . Calculate the self-inductance of the toroid.

A toroid having 200 turns carries a current of 1A. The average radius of the toroid is 10 cm. the magnetic field at any point in the open space inside the toroid is

A circular coil of wire of radius r has 600 turns and self inductance 108mH .The self inductance of a coil with same radius and 500 turns is

Two coils are made of copper wires of same length in the first coil the number turns is 3n and radius is r. In the second coil number of turns is n and radius is 3r the ratio of self inductances of the coils will be :-