Electromagnetic Induction
Electromagnetic Induction: Overview
This Topic covers sub-topics such as Electromagnetic Induction, Galvanometer, Fleming's Right-Hand Rule, AC Current, DC Current, Induced Current, Faraday’s Experiments and, Production of Induced Current in a Coil
Important Questions on Electromagnetic Induction
A current that always flows through an electric device in the same direction is called direct current or . The polarity (positive and negative) of a direct current is fixed. A current that reverses direction at equal intervals of time is called the alternating current or . The polarity (positive and negative) of an alternating current is not fixed. Both and can be used for lighting and heating. Some electric devices like the television need to operate. In such cases, an adapter or a device is fitted into them to convert from the mains supply to .
On the basis of above information, answer the following:
What is the frequency of alternating current in India?
Faraday's experiment explains electromagnetic induction by moving the coil.
Faraday's experiment explains electromagnetic induction by moving the magnet.
Describe faraday's experiment on electromagnetic induction in a current-carrying coil.
What is the difference between a direct current and an alternating current? How many times does used in India change direction in one second?
The domestic electricity in India is an AC with a frequency of:
The rectangular coil of copper wires is rotated in a magnetic field. The direction of induced current change once in each_________.
Compass needle experiences a force in _____ field of a bar magnet due to which it deflects.
The AC generator is more _____ than DC generator.
An electrical cell is a device that is used to generate _____.
The magnet attracts small pieces of _________.
The magnetic poles always exist in _____.
The essential difference between an AC generator and a DC generator is that_____________________.
The device used for producing electric current is called a ________.
The frequency of alternating current in India is
The strength of an electromagnet can be increased by _____.
Electromagnets is usually an insulated wire wounded around an iron bar.
Electromagnets create magnetic field by means of electric current.
If the alternating current in India completes cycles in a second, the frequency of the AC is said to be-
Which of the following is true about a galvanometer when a direct current passes through the circuit?
