CBSE Class 10 Science Chapter 13: Magnetic Effects of Electric Current NCERT Solutions
This chapter delves into the fascinating world of magnetic effects produced by electric currents. The NCERT Solutions for Class 10 Science, Chapter 13, cover key concepts such as magnetic field lines, their properties, and the magnetic field produced by a current-carrying conductor. It explains how to determine the direction of the magnetic field using compasses and explores the nature of magnetic field lines around straight conductors and circular loops. The solutions also address the magnetic field generated by a solenoid. These solutions are designed to help students grasp the fundamental principles of electromagnetism, understand the behavior of magnetic fields, and build a strong foundation for future studies in physics. They provide clear explanations and step-by-step approaches to solve problems, aiding in effective exam revision and a deeper understanding of the subject.
Quick info
| Board | CBSE |
|---|---|
| Class | Class 10 |
| Subject | Science (Exemplar) |
| Session | 2026 |
| Language | English |
| Type | NCERT Solutions |
| Chapter | 13. Magnetic Effects of Electric Current |
Chapter summary
Chapter 13 of the NCERT Class 10 Science textbook focuses on the Magnetic Effects of Electric Current. The provided solutions cover the properties of magnetic field lines, including their direction and representation of field strength. They explain the magnetic field patterns around current-carrying conductors and circular loops, and how to identify poles based on current direction. These solutions are crucial for understanding the relationship between electricity and magnetism as introduced at this level.
Learning outcomes
- Understand the properties of magnetic field lines.
- Determine the direction of magnetic field lines around a current-carrying conductor.
- Identify the magnetic poles of a coil based on current direction.
- Differentiate between uniform and non-uniform magnetic fields.
- Solve multiple-choice questions related to magnetic effects of electric current.
Topics covered
Paper topics
- Magnetic field lines
- Properties of magnetic field lines
- Magnetic field due to a current-carrying conductor
- Magnetic field due to a circular loop
- Direction of magnetic field
- Magnetic poles
- Uniform magnetic field
- Strength of magnetic field
Important topics
- Properties of magnetic field lines
- Magnetic field due to current-carrying conductor
- Direction of magnetic field
- Identifying magnetic poles from current direction
PDF preview
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Questions and Solutions
Multiple Choice Questions
1. Choose the incorrect statement from the following regarding magnetic lines of field.
(a) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.
(b) Magnetic field lines are closed curves.
(c) If magnetic field lines are parallel and equidistant, they represent zero field strength.
(d) Relative strength of magnetic field is shown by the degree of closeness of the field lines.
Explanation: Magnetic field lines are indeed closed curves (b), and their relative strength is indicated by how close they are to each other (d). The direction of the magnetic field at any point is defined by the direction a north pole of a compass needle points (a). Statement (c) is incorrect because parallel and equidistant magnetic field lines represent a uniform magnetic field, not zero field strength. A zero field strength would imply the absence of magnetic field lines.
2. If the key in the arrangement (Figure 13.1) is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
(a) concentric circles
(b) elliptical in shape
(c) straight lines parallel to each other
(d) concentric circles near the point O but of elliptical shapes as we go away from it
(Refer to Figure 13.1 showing a long straight conductor with a variable resistance and a key in a circuit.)
Explanation: When the key is taken out, the circuit is open, meaning no current flows through the long straight conductor. A current-carrying conductor produces a magnetic field. In the absence of current, the conductor itself does not generate a magnetic field. Therefore, the magnetic field lines observed in the horizontal plane ABCD will primarily be due to the Earth's magnetic field, which, in this context, can be approximated as concentric circles centered around the conductor's axis, especially if we are considering the field generated by the conductor if it were active.
3. A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti clockwise and clockwise respectively. The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to
(a) A
(b) B
(c) A if the current is small, and B if the current is large
(d) B if the current is small and A if the current is large
(Refer to Figure 13.2 showing a circular loop with points A and B on its axis.)
Explanation: Magnetic field lines conventionally emerge from the North pole and enter the South pole. The problem states that the magnetic field lines point from B to A. This indicates that A is the region where the field lines are emerging from, and B is where they are entering. Therefore, the face of the coil near point A acts as the North pole of the magnet formed by the current loop.
Common mistakes
- Confusing the direction of magnetic field lines with the direction of current.
- Misinterpreting parallel and equidistant field lines as zero field strength.
- Incorrectly applying the right-hand rule for determining magnetic field direction.
- Confusing the poles of a magnet formed by a current-carrying coil.
Revision tips
- Review the properties of magnetic field lines thoroughly.
- Practice drawing magnetic field lines for different current configurations.
- Use a compass to visualize magnetic fields and relate them to the concepts.
- Focus on understanding the right-hand rule for determining field direction.
- Solve all the provided MCQs to test your understanding of the chapter's core concepts.
Practice MCQs
Q1. Which of the following statements about magnetic field lines is incorrect?
Explanation: Parallel and equidistant magnetic field lines actually represent a uniform magnetic field, not zero field strength. Zero field strength would be indicated by the absence of field lines.
Q2. When the circuit in Figure 13.1 is open (key removed), and magnetic field lines are observed in the horizontal plane ABCD, what is their shape?
Explanation: When the circuit is open, there is no current flow. The magnetic field lines observed in the horizontal plane around the conductor will be concentric circles, primarily influenced by the Earth's magnetic field if the conductor itself is not generating a field.
Q3. In the arrangement shown in Figure 13.2, a current flows through a circular loop. If the current is seen as anti-clockwise from point A and clockwise from point B, and the magnetic field lines point from B to A, which point represents the North pole of the resulting magnet?
Explanation: Magnetic field lines emerge from the North pole and enter the South pole. Since the field lines are pointing from B to A, point A must be the North pole and point B must be the South pole.
Frequently asked questions
What are the key concepts covered in CBSE Class 10 Science Chapter 13 NCERT Solutions?
The solutions cover the properties of magnetic field lines, the magnetic field produced by electric currents in straight conductors and circular loops, and how to determine the direction and strength of these fields.
How do these NCERT Solutions help in exam preparation?
These solutions provide clear explanations and step-by-step answers to MCQs, helping students understand the concepts, identify common mistakes, and revise effectively for their exams.
What is the significance of magnetic field lines?
Magnetic field lines are used to represent the direction and relative strength of a magnetic field. They are closed curves, and their closeness indicates the strength of the field.
How can I determine the North pole of a magnet formed by a current-carrying coil?
You can use the direction of the current and the right-hand rule. If the current appears anti-clockwise when viewed from a face, that face is the North pole.
Are the questions in the source document fully preserved?
Yes, all questions from the source document are retained with their original numbering and problem statements. The wording has been expanded for clarity where needed.
Are the solutions rewritten in the provided NCERT Solutions?
Yes, every solution has been rewritten to provide clearer, more detailed explanations and step-by-step guidance, while maintaining the accuracy of the original answers.
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