Two coils A and B have 200 and 400 turns respectively. A current of 1 A in coil A causes a flux per turn of `10^(-3)` Wb to link with A and a flux per turn of `0.8xx10^(-3)` Wb through B. the ratio of mutual inductance of A and B is

There are two coils A and B separated by some distance. If a current of 2A flows through A, a magnetic flux of 10^-2 Wb passes through B(no current through B). If no current passes through A and a current of 1A passes through B, what is the flux through A?

A long solenoid has 500 turns. When a current of 2 A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 xx 10^(-3)Wb. The self-inductance of the solenoid is

A secondary coil of N_2 turns is wound on a long solenoid of cross-section. A and having a primary coil n_1 turns per unit length. What is mutual inductance of the two coils?

A current balance is a device to measure magnetic forces. It is constructed from two parallel coils, each with an average radius of 12.5 cm. The lower coil rests on a balance, it has 20 turns and carries a constant current of 4.0 A. The upper coil, suspended 0.314 cm above the lower coil, has 50 turns and a current that can be varied. The reading of the balance changes as the. magnetic force on the lower coil changes. What current is needed in the upper coil to exert a force of 1.0 N on the bottom coil?