Question
Explain AC generator by drawing a labelled diagram. Obtain an expression for instantaneous magnitude of induced electromotive force.

Answer

SELF

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A room has $AC$ run for $5$ hours a day at a voltage of $220V.$ The wiring of the room consists of $Cu$ of $1\ mm$ radius and a length of $10m.$ Power consumption per day is $10$ commercial units. What fraction of it goes in the joule heating in wires? What would happen if the wiring is made of aluminium of the same dimensions?
$[\rho _{cu} = 1.7 \times 10^{-8}_{\Omega m} , \rho _{Al} = 2.7 \times 10^{-8} \Omega m]$
A parallel$-$plate capacitor with the plate area $100\ cm^2$ and the separation between the plates $1.0\ cm$ is connected across a battery of emf $24$ volts. Find the force of attraction between the plates.
A conducting wire of length l, lying normal to a magnetic field B, moves with a velocity v, as shown in the figure.
  1. Find the average magnetic force on a free electron of the wire.
  2. Due to this magnetic force, electrons concentrate at one end, resulting in an electric field inside the wire. The redistribution stops when the electric force on the free electrons balances the magnetic force. Find the electric field developed inside the wire when the redistribution stops.
  3. What potential difference is developed between the ends of the wire?
What do you understand by self-induction?Obtain an expression for self-induction of a solenoid.###Define self-induction. Obtain an expression for self-induction of a solenoid of N turns, length $l$ and area of cross-section A.
A particle of mass m and positive charge q, moving with a uniform velocity v, enters a magnetic field B, as shown,
  1. Find the radius of the circular arc it describes in the magnetic field.
  2. Find the angle subtended by the arc at the centre.
  3. How long does the particle stay inside the magnetic field?
  4. Solve the three parts of the above problem if the charge q on the particle is negative.
Three bulbs, each with a resistance of $180\Omega,$ are connected in parallel to an ideal battery of emf 60V. Find the current delivered by the battery when.
(a) all the bulbs are switched on, (b) two of the bulbs are switched on and (c) only one bulb is switched on.
Find the acceleration of the $500g$ block in figure.
A capacitor of capacitance $12.0\mu\text{F}$ is connected to a battery of emf 6.00V and internal resistance $1.00\Omega$ through resistanceless leads. $12.0\mu\text{s}$ after the connections are made, what will be
A disc of radius R is cut out from a larger disc of radius 2R in such a way that the edge of the hole touches the edge of the disc. Locate the centre of mass of the residual disc.
A sound wave of frequency 100Hz is travelling in air. The speed of sound in air is 350m/s.
  1. By how much is the phase changed at a given point in 2.5ms?
  2. What is the phase difference at a given instant between two points separated by a distance of 10.0cm along the direction of propagation?