Electromagnetic...

The phenomena of a electromagnetic induction is

When current flowing in a coil changes from $$3A$$ to $$2A$$ is one millisecond, $$5\ volt$$ emf is induced in it. The self-inductance of the coil will be 

The self induced e.m.f.in a 0.1 H coil when the current in it is changing at the rate of 200 ampere/second is 

A long solenoid  of diameter $$0.1\ m$$ has $$2 \times {10^4}$$ turns per metre.At the centre of the solenoid, a coil of $$100$$ turns and radius $$0.01\ m$$ is placed with its axis coinciding with the solenoid axis.The current in the solenoid reduces at a constant rate to $$0\ A$$ from $$4\ A$$ in $$0.05\ s$$. If the resistance of the coil is $$10 \ {\pi ^2}\Omega ,$$ the total charge flowing through the coil during this time is.

The coefficients of self induction of two inductance coils arc 0.0 1H and 0.03H respectively. When they are connected in series so as to support each other. then the resultant self inductance becomes 0.06 Henry. The value of coefficient of mutual induction will be-

When a coil is connected to a D.C source of emf 12V,a current of 4 amp flows in it.If same coil  is connected to 12V,50Hz AC source, the current is 2.4 A. The self inductance of the coil is (in henry)

An average emf of $$20 V$$ is induced in an inductor when the current in it is changed from $$2.5 A$$ in one direction to the same value in the opposite direction in $$0.1$$ s. The self-inuctance of the inductor is

A magnetic field $$\vec {B}=B_{0}\hat {k}$$ is present in elliptical region given by $$\dfrac{x^{2}}{a^{2}}+\dfrac{y^{2}}{b^{2}}=1$$. If conducting rod of length $$2b (< 2a)$$ is kept parallel to $$y-$$axis, The rod starts moving with velocity $$v \hat {i}$$ and at $$t=0$$ centre of rod is at $$(-a, 0)$$. Find motional $$EMF$$ in rod as function of time $$t.t < \dfrac{2a}{v}$$. 

An electron having kinetic energy T is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction $$\vec { \mathrm { B } }$$  If kinetic energy is doubled and magnetic induction tripled, the radius will

In electromagnetic induction, The induced e.m.f in a coil is 
in depended of