Electromagnetic...

A solenoid of inductance $$L$$ and length $$l$$ and mass $$m$$, whose windings are made of material of density $$D$$ and resistivity is $$\rho$$,(the winding resistance is $$R$$). Find out the inductance in terms of others.

The self induction takes place when magnetic flux through a coil :

A toroid is wound over a circular core with total no. of turns equal to $$N$$. The 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 wire of fixed length is wound on a solenoid of length $$l$$ and radius $$r$$. Its self-inductance is found to be $$L$$. Now, if the same wire is wound on a solenoid of length $$l/2$$ and radius $$r/2$$, then the self-inductance will be

The length of a wire required to manufacture a solenoid of length $$l$$ and self-induction $$L$$ is (cross-sectional area is negligible)

Two coils X and Y are linked such that emf $$E$$ is induced in Y when the current in X is changing at the rate $$I'(=dI/dt)$$. If a current $$I_0$$ is now made to flow through Y, the flux linked with X will be

The time constant of an inductance coil is $$2\times 10^{-3}s$$. When a $$90\Omega$$ resistance is joined in series, the same constant becomes $$0.5\times 10^{-3}s$$. The inductance and resistance of the coil are

Two coils are at fixed locations. When coil 1 has no current and the current in coil 2 increases at the rate of $$15.0 As^{-1}$$, the emf in coil 1 is $$25 mV$$. When coil 2 has no current and coil 1 has a current of $$3.6A$$, the flux linkage in coil 2 is

Calculate the inductance of a unit length of a double tape line as shown in figure. The tapes are separated by a distance $$h$$ which is considerably less than their width $$b$$.

The coil is wound on an iron core and looped back on itself so that core has two sets of closely wound coils carrying current in opposite directions. The self inductance is