Solving problems based on inductance

Find the equivalent inductance as shown in the figure? take the first inductance as 0.5H.

An iron ring 30cm mean diameter is made of a square of iron of 2cm x 2cm cross section and is uniformly wound with 400 turns of wire. The value of self-inductance will be__. Take  

A circuit has 1000 turns enclosing a magnetic circuit of in section. With 4A, the flux density is and with 9A it is . The mean value of inductance between these current limits is_

A long single layer solenoid produces . There is a small concentrated coil having its plane lying in the center cross sectional plane of the solenoid. The mutual inductance between the coils, if the concentrated coil has 120 turns on an effective diameter of 8cm.

A circuit has 1000 turns enclosing a magnetic circuit of in section. With 4A, the flux density is and with 9A it is .If the current falls from 9A to 4A in 0.05s the induced EMF will be__

Two coils A and B each having 1200 turns are placed near each other. When coil B is open circuited and coil A carries a current of 5A, the flux produced by coil A is 0.2Wb and 30% of this flux links with all the turns of coil B. The voltage induced in coil B on open-circuit when the current in the coil A is changing at a rate of 2 A/s is_

A flux of 0.5mWb is produced by a coil of 900 turns on a ring with a current of 3A in it. The mutual inductance between the coils, if a second coil of 600 turns in uniformly wound over the first coil.

If a coil of 150 turns is linked with a flux of 0.01Wb when carrying a current of 10A. If a second coil of 100 turns is uniformly wound over the first coil, the mutual inductance between the coils is_

If a coil of 150 turns is linked with a flux of 0.01Wb when carrying a current of 10A. If this current is uniformly reversed in 0.1 second, the induced EMF is __

Two identical coils X and Y of 1000 turns each lie in parallel planes such that 80% of flux produced by one coil links with the other. If a current of 5A flowing in X produces a flux of 0.5mWb, the mutual inductance between X and Y is_

A flux of 0.5mWb is produced by a coil of 900 turns on a ring with a current of 3A in it. The EMF induced in the coil when a current of 5A is switched off, assuming the current to fall to zero in 1 milli second.

If a coil of 150 turns is linked with a flux of 0.01Wb when carrying a current of 10A. If this current is uniformly reversed in 0.01 second, the induced EMF will be__

A flux of 0.5mWb is produced by a coil of 900 turns on a ring with a current of 3A in it. The inductance of the coil is __

The field winding of DC electromagnet is wound with 960 turns and has a resistance of when the exciting voltage is 230V, the magnetic flux linking the coil is 0.005Wb. The self inductance of the coil is _

The total inductance of two coils A and B when connected in series is 0.5H or 0.2H, depending on the relative directions of the current in the coils. Coil A when isolated from coil B, has a self inductance of 0.2H. The mutual inductance between the two coils is__