Electromagnetic Induction
Trending Questions
What are magnetic lines of force? List the properties of magnetic lines of force?
What is electricity?
State the Principle of an Electric Generator
What is dynamically induced EMF?
What is the direction of the magnetic field lines surrounding a permanent magnet?
North to south pole of the magnet
South to north pole of the magnet
Can be in any direction
Data insufficient
An electric charge in uniform motion produces :
Electric field only
Magnetic field only
No such field at all
Both electric and magnetic fields
What is the working principle of an electric generator ?
A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then
A current will be induced in the coil
No current will be induced in the coil
Only emf will be induced in the coil
Emf and current both will be induced in the coil
What are the basic characteristics of a transformer?
Why do magnetic lines of force start at the North pole and end at the south pole outside the magnet while inside the magnet, the lines of force move from the south pole to the North pole?
Why is AC power used instead of DC?
A metal disc of radius is rotated at a constant angular speed of in a plane at right angles to an external field of magnetic induction . The e.m.f induced between the center and a point on the rim will be
Explain why the core of an electromagnet should be of soft iron and not of steel.
A magnet is brought towards a coil
- speedily
- slowly
What will be the induced e.m.f./induced charge respectively?
Two ways by which the emf in an AC generator can be increased by
increasing the speed of rotation and increasing the number of turns of the coil
decreasing the speed of rotation and increasing the number of turns of the coil
increasing the speed of rotation and decreasing the number of turns of the coil
using stronger field magnets and decreasing the number of turns of the coil
The coefficient of mutual induction is the ratio of___________.
“When a magnet is brought close to the loop, the induced current in the loop will be in a direction such that the part of the loop facing the magnet repels the magnet.”
Using the above statement, choose the correct answers.
When the north pole of the magnet is brought close to the loop, the current will be anticlockwise
When the south pole of the magnet is brought close to the loop, the current will be clockwise
When the south pole of the magnet is brought close to the loop, the current will be anticlockwise
When the north pole of the magnet is brought close to the loop, the current will be clockwise
Question 2
The phenomenon of electromagnetic induction is
(a) the process of charging a body.
(b) the process of generating magnetic field due to a current passing through a coil.
(c) producing induced current in a coil due to relative motion between a magnet and the coil.
(d) the process of rotating a coil of an electric motor.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
Two revolutions
One revolution
Half revolution
One-fourth revolution
State the principle of AC generator.
The device used for producing electric current is called
Ammeter
Generator
Galvanometer
Motor
Why is soft Iron core used in Galvanometer?
Explain with the aid of a simple diagram, the transmission of electric power from the generating station to your house.
Explain flow of charges inside a wire.
Name the instrument used to control current in an electric circuit.