Electromagnetic Induction Physics - Electromagnetic Induction

Two inductor coils with inductance \(10 mH\) and \(20 mH\) are connected in series. What is the resultant inductanc of the combination of the two coils?

What does the negative sign indicate in Lenz's law?

At which position of the plane of the rotating coil with the direction of magnetic field, the e.m.f. induced in the coil is maximum?

A straight conductor is moving with a velocity of \(3 m / s\), at right angles to a magnetic field \(4.5 \times 10^{-5} Wb / m ^2\). If an e. m. f. developed between its ends is \(1.35 \times 10^{-4}\) volt, calculate the length of straight conductor.

State Faraday's laws of electromagnetic induction.

Define the following: (a) Self inductance (b) Mutual inductance.

A coil of 100 turns, each of area \(0.02 m ^2\) is kept in a uniform field of induction \(3.5 \times 10^{-5} T\). If the coil rotates with a speed of 6000 r.p.m. about an axis in the plane of the coil and perpendicular to the magnetic induction, calculate peak value of e.m.f. induced in the coil.

An A.C. circuit consists of inductor of inductance \(125 mH\) connected in parallel with a capacitor of capacity \(50 \mu F\). Determine the resonant frequency.

Obtain an expression for average power dissipated in a purely resistive A.C. circuit. Define power factor of the circuit and state its value for purely resistive A. C. circuit.

An emf of \(91 mV\) is induced in the windings of a coil, when the current in a nearby coil is increasing at the rate of \(1.3 A / s\), what is the mutual inductance \(( M )\) of the two coils in \(mH\) ?

Assuming expression for impedance in a parallel resonant circuit, state the conditions for parallel resonance. Define resonant frequency and obtain an expression for it.

Explain self induction and mutual induction.

Prove theoretically, the relation between e.m.f. induced and rate of change of magnetic flux in a coil moving in a uniform magnetic field.

Explain the phenomenon of self induction and mutual induction. Define coefficient of self induction and mutual induction. Write the SI unit and dimensions of coefficient of self induction

Obtain an expression for the induced e.m.f. in a coil rotating with uniform angular velocity in uniform magnetic field. Plot a graph of variation of induceed e.m.f. against phase (0= wt) over one cycle.

Prove theoretically, the relation between e.m.f. induced and rate of change of magnetic flux in the electric circuit in electromagnetic induction.

What is transformer? With the help of suitable diagram describe working of transformer.

What is series LCR circuit? Obtain the expression for impedance. Hence state the conditions for series resonance and derive the expression for resonant frequency.