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Magnetic effect of a current

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Class 10 Physics Chapter 10
Magnetic effect of a current
Important Questions

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The magnetic effect of a current refers to the phenomenon where a current-carrying conductor produces a magnetic field around it. This fundamental principle underpins the operation of many electrical devices, including electric motors, transformers, and electromagnets. Here you will find class 10 Magnetic effect of a current important questions and answers.

Introduction

When an electric current flows through a conductor, it produces a magnetic field around it. This phenomenon is known as the magnetic effect of electric current. The magnetic effect of electric current was first discovered by Hans Christian Oersted in 1820. The magnetic field due to a current-carrying conductor can be represented by magnetic field lines, which are imaginary lines that indicate the direction and strength of the magnetic field. The tangent to a field line at any point gives the direction of the magnetic field at that point. If you want to prepare well and clear your understanding then below are some ICSE class 10 physics important questions chapter wise 2024

What are Magnetic effect of a current?

The magnetic effect of electric current refers to the phenomenon where a magnetic field is produced around a conductor when an electric current flows through it. The magnetic field’s strength and direction depend on the magnitude and direction of the current and the nature of the conductor.Creation of a Magnetic Field: Any current-carrying conductor produces a magnetic field around it. The strength of this field increases with an increase in the current and decreases as one moves further away from the conductor. If you want to practice more questions and clear your understanding, then oswal.io provides you with ICSE class 10 physics important questions chapter wise 2024
important question of physics class 10 icse

Class 10 Magnetic effect of a current Important Questions and Answers

Q1. In the following picture the magnetic field line over a horizontal plane ABCD will be :
important question of physics class 10 icse Qs1
Options
(a) Elliptical in shape
(b) Concentric circle
(c) Straight lines
(d) Concentric at the centre elliptical as to away

Ans. (b) Concentric circle
Explanation:
Magnetic field lines around a straight current carrying conductor are in the form of concentric circle.Magnetic field lines, also known as magnetic flux lines or magnetic lines of force, provide a visual representation of the magnetic field around a magnet or a current-carrying conductor. They offer a way to visualize the strength and direction of the magnetic field in space.

Q2. Looking at the face of a loop, if the current around the face is in an anticlockwise direction, which kind of polarity will the face have?
Options
(a) North polarity
(b) South polarity
(c) East polarity
(d) West polarity

Ans. (a) North polarity
Explanation:
As per the clock rule, looking at the face of a loop, if the current around the face is in an anticlockwise direction then the face with have current in clockwise direction has the north polarity, while the face has the South polarity.

Q3. A current carrying solenoid is suspended so as to freely rotate in a horizontal plane. State in what direction will it rest. Give reason to your answer.?
(b) Is it safe to connect this electric geyser with the live wire?

Explanation:
The current carrying solenoid when suspended freely, will rest along the N-S direction. The reason is that it will behave like a bar magnet, with N polarity at one face of solenoid and S polarity at the other face, depending upon the direction of current in the solenoid. Current carrying solenoid behaves like a bar magnet. At end in which direction of current is anticlockwise, behaves as north pole and where current is in clockwise direction behaves as south pole. Therefore on suspending the current carrying solenoid freely, it sets itself in N-S direction as bar magnet does.

Q4. State two ways to increase the speed of rotation of a D.C. motor?

Explanation:
Two ways to increase the speed of rotation of a D.C. motor are as follows:
(i) By increasing the strength of current in the coil.
(ii) By reducing the number of turns in the coil.
The speed of a DC motor is inversely proportional to the magnetic field's strength. By varying the current passing through the field winding (in case of wound field motors), the strength of the magnetic field and, hence, the speed of the motor can be controlled.

Q5. What will happen to a compass needle when the compass is placed below a wire and a current is made to flow through the wire? Give a reason to justify your answer.

Explanation:
The compass needle will show deflection. This happens because when a current is passed through a conductor (here, wire), a magnetic field is produced around the conductor due to which the compass needle gets deflected.

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ICSE Class 10 Physics Chapter wise Important Questions

Conclusion

The magnetic effect of electric current is a cornerstone concept in the realm of physics. It has not only deepened our understanding of the natural world but also paved the way for myriad technological advancements that have revolutionised modern society. The intertwining of electricity and magnetism exemplifies the interconnectedness and unity of the forces of nature. If you seek additional practice and a deeper comprehension of the topics covered in the chapter, oswal.io offers an extensive array of icse physics class 10 magnetic effect of electric current important questions to facilitate a more profound understanding of the concepts.

Frequently Asked Questions

Ans: The magnetic effect of electric current refers to the generation of a magnetic field around a conductor when an electric current flows through it.
Ans: Hans Christian Oersted first discovered the magnetic effect of electric current in 1820.
Ans: The right-hand thumb rule can be used. If you grip the conductor with your right hand with the thumb pointing in the direction of the current, your curled fingers indicate the direction of the magnetic field lines around the conductor.
Ans: A solenoid is a coil made up of multiple turns of wire, often wrapped closely. When current flows through a solenoid, it produces a strong magnetic field inside it, resembling that of a bar magnet with distinct North and South poles.
Ans: The strength of the magnetic field decreases as one moves further away from the current-carrying conductor.
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