Class 10 Science – What is Electromagnet? Magnetic Effect of Current
In this article, we will study the topic Electromagnet, How electric motors work? and Law of Electromagnetic Induction from chapter Magnetic effect of current, out of Class 10 Science.
What is Electromagnet?
The electromagnet is formed by the use of a strong magnetic field inside the solenoid to magnetize the magnetic material. Such material can be a soft iron.
Properties
- With the increase in electric current, the magnitude of the magnetic field also increases, and vice versa.
- With an increase in distance, the magnitude of the magnetic field decreases, and vice versa.
- Magnetic field lines are always parallel.
- No two lines intersect each other.
Force on a current-carrying conductor in a magnetic field
As per Andre Marie Ampere (1775-1836), the magnet exerts the equal and opposite force on the current carrying conductor. This is illustrated in the below diagram.
In the diagram, the rod experiences the force when it is placed in a magnetic field in a perpendicular direction to its length.
When the direction of current through the conductor is reversed, the direction of the extended force will be reversed.
When the direction of the field is changed by changing the two poles of the magnet, the direction of exerting force will change.
Left-Hand thumb rule
According to this rule, when we stretch the thumb, forefinger, and middle finger of the left hand, the forefinger and middle finger represent the direction of a magnetic field and the thumb points in the direction of the force acting on the conductor.
Electric Motor
It works on the basis of the left-hand rule. By using an electric motor, the electric energy is converted into mechanical energy.
Click to 10th online classes for all subjects for better practices in exams
How electric motors work?
In the motor, the rectangular coil is suspended between two poles of a magnetic field. The electric supply to the coil is connected with an accumulator.
When current is passed to the coil, it gets deflected because of the magnetic field. The current reaches halfway and spilled rings reverse the current direction and the direction of the force acting on a coil also reverses.
When the current moves towards another half, the change in direction of force pushes the coil. The coil completes the one rotation and this process keeps the motor in the rotation.
Law of Electromagnetic Induction
This law was founded by Michael Faraday. As per the law, the conductor is set to move inside a magnetic field when an electric current is induced into it.
Galvanometer
The galvanometer is the instrument used to detect the presence of a current in the conductor. If the point of it is at zero, it means there is no current. The pointer reflects the direction of the current deflecting either right or left.
Browse the related video lecture on Displacement Current
Here at Takshila Learning, we provide Online Tuition Classes from Preschool to Class 12 for all subjects. We provide the best online tuition classes that comprise Animated Video lectures and Live Interactive Classes that will help students to grasp concepts easily.
We also provide study material, Worksheets & Assignments, Doubt sessions, Free Encyclopedia, NCERT Solutions, and Exam Guru to monitor your progress, i.e., subject-wise and topic-wise. So now Enjoy E-Learning with Takshila Learning…
Learning is fun now!
Enroll today & Get Free Demo Class!
Call us: 8800999280/8800999284 or fill the form for any other details:
Tag: Electromagnetic, Electric Motor, Law of Electromagnetic Induction, Galvanometer, Class 10 science
0 responses on "What is Electromagnet? Magnetic Effect of Current - Class 10 Science"