- Trending Categories
- Data Structure
- Operating System
- MS Excel
- C Programming
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
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.
The correct answer is: $(c)$ producing induced current in a coil due to relative motion between a magnet and the coil.
The change in magnetic field lines in a coil is the cause of induced electric current in it, and this phenomenon is known as Electromagnetic induction.
Electromagnetic Induction is a process where a conductor placed in a changing magnetic field $(or\ a\ conductor\ moving\ through\ a\ stationary\ magnetic\ field)$ causes the production of an Electro-Motive Force $(Voltage)$ across the electrical conductor.
The process of electromagnetic induction works in reverse as well, so that a moving electrical charge generates a magnetic field.
The below diagram shows the experiment of electromagnetic induction with the help of a galvanometer, a coil, and a magnet.
- When the magnet is moved up toward the coil, the magnetic field increases which shows deflection in the needle of the galvanometer.
- When the magnet moves down, the magnetic field in the coil decreases which can be observed as a deflection in the galvanometer.
- When the magnet is not moved, there is no deflection observed in the galvanometer.
- Related Articles
- How does the magnetic field of secondary coil change when the magnetic field of first coil increases due to increase in flow of current?
- The change in magnetic field lines in a coil is the cause of induced electric current in it. Name the underlying phenomenon.
- The shape of the earth’s magnetic field resembles that of an imaginary:(a) U-shaped magnet (b) Straight conductor carrying current (c)Current-carrying circular coil (d) Bar magnet
- Name the device which is used to reverse the direction of current in the coil of a motor?
- Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
- (a) Draw the magnetic lines of force due to a circular wire carrying current.(b) What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?
- A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is $(i)$. pushed into the coil,$(ii)$. withdrawn from inside the coil,$(iii)$. held stationary inside the coil?
- A coil of insulated copper wire is connected to a galvanometer. What would happen if a strong bar magnet is (a) pushed into the coil?(b) withdrawn from inside the coil?(c) held stationary inside the coil?Give justification for each observation.
- State the rule to determine the direction of a $(i)$. magnetic field produced around a straight conductor-carrying current,$(ii)$. the force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and$(iii)$. current induced in a coil due to its rotation in a magnetic field.
- Current Coil
- Of what substance is the core of the coil of an electric motor made?
- Explain different ways to induce current in a coil.
- In an electric motor, the direction of current in the coil changes once in each:(a) two rotations (b) one rotation (c) half rotation (d) one-fourth rotation
- Fill in the following blanks with suitable words:(a) The lines of _______ round a straight current-carrying conductor are in the shape of _______.(b) For a current-carrying solenoid, the magnetic field is like that of a _______.(c) The magnetic effect of a coil can be increased by increasing the number of _______, increasing the _______, or inserting an _______ core.(d) If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a _______ pole.(e) If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a _______ pole.
- State whether the following statements are true or false.$(a)$. An electric motor converts mechanical energy into electrical energy.$(b)$. An electric generator works on the principle of electromagnetic induction.$(c)$. The field at the centre of a long circular coil carrying current will be parallel straight lines.$(d)$. A wire with a green insulation is usually the live wire of an electric supply.