Activity Solution Chapter 13 Magnetic Effects

Activity Solution Chapter 13 Magnetic Effects of Electric Current.

In chapter 12, we studied electric current. In this chapter, we study the magnetic effects produced by the current. Below is the explanation of various activities with the conclusion for this chapter.


Activity Solution 13.1 Class 10 Science Chapter 13

Brief procedure: Activity 13.1 asks us to place a copper wire near a compass and switch on the current.

Observation: Compass needle deflects when electricity passes through the copper wire.


Whenever there is a change in the current, it produces an electric field. In normal usage, a compass detects the magnetic field of the earth. When we bring the compass near a wire and pass current, an artificial magnetic filed produces. This artificial magnetic field deflects the compass.

Note: This is one of the fundamental property of the current. It was discovered accidently by Oersted using the same experiment. This discovery led to the invention of many devices like the radio, TV, etc. So, in his honor, we call the unit of a magnetic field as OerstedO‘.

Conclusion: This phenomenon shows the relationship between the current flowing through a wire and its magnetic effect. It shows that a current produces magnetic filed which deflect the compass.

Activity Solution 13.2 Class 10 Science Chapter 13

Brief Procedure: Activity 13.2 asks us to dust some iron filings near a bar magnet.

Observation: Iron filings arrange themselves in a fixed parabolic pattern.

Explanation: A bar magnet attracts iron particles. This force of attraction differs from place to place near a magnet and forms a magnetic field of characteristic shape. When we dust the iron filings, iron particles arrange themselves in a fixed pattern as per the nearby magnetic field.

Conclusion: A magnet has a magnetic field in its surrounding which differ from place to place.

Activity Solution Chapter 13 Magnetic Effects of Electric Current by Studdy

Activity Solution 13.3 Class 10 Science Chapter 13

Brief Procedure: Activity 13.3 asks us to move a compass on a magnet from one pole to the second pole.

Observation: The compass needle always remains in one direction i.e. North pole of the needle always point towards the south.

Explanation: A magnet consists of two opposite poles: the north and the south. A compass needle is also a small bar magnet. It also has a north as well as a south pole. North pole of a magnet attracts south pole only. So, when we place the compass near a magnet, the north pole of the compass aligns itself to the south pole of the magnet. When we move the compass only the magnetic field intensity changes; the direction of the pole remains the same. As a result, we see the same direction in the compass near a magnet.

Conclusion: Here we see that poles of a magnet attract the opposite poles only. This means the magnetic field has a direction. For convention, we assume the magnetic field emerges from the north and goes into the south.

Activity Solution 13.4 Class 10 Science Chapter 13

Brief Procedure: Activity 13.4 asks us to change the direction of current in a wire and see the deflection in the compass.

Compass also changes its direction with change in direction of current in a nearby wire.

Observation: When we reverse the direction of the current, compass needle also reverses its direction.

If current flows from north to south, the direction of the needle is east; similarly, if the direction of current is reversed the direction of compass point towards west.


When we pass current into a wire, it produces a magnetic field. This field is perpendicular to the direction of the current. So, if current flows from north to south, east becomes the north pole of the magnetic field. In such a situation the south pole of magnet aligns with the north pole and see compass directing towards the east.

Similarly, if we change the direction of the current by changing the terminals of the battery, the direction of current reverses. This results in the production of a magnetic field in the opposite direction. As a result, the compass also reverses its direction.

Conclusion: Magnetic filed is a vector quantity.

Note: We can use Right thumb rule to find the direction: Palm on the plane and movement of fingers in the direction of the current gives thumb as North pole.

Activity Solution 13.5 Class 10 Science Chapter 13


Ncert class 10 Science solutions

1. Chemical Reactions and Equations

2. Acids, Bases, and Salts.

3. Metals and Non-metals.

4. Carbon and its Compounds.

6. Life processes.

7. Control and Coordination.

8. How do Organisms Reproduce?

9. Heredity and evolution.

10. Light – Reflection and Refraction.

12. Electricity.

13. Magnetic Effects of Electric Current.

14. Sources of Energy.

15. Our Environment

Ref: NCERT Science Class 10.

5 thoughts on “Activity Solution Chapter 13 Magnetic Effects”

  1. In activity 13.5 it is shown that there are magnetic field lines around a current carrying conductor. The iron fillings align themselves in the form of concentric circles ( circles with same centre) representing magnetic field lines. You can find the direction of the magnetic field lines using a compass. Also the direction of magnetic field lines gets reversed when we reverse the direction of the current ( You can check by right hand thumb rule).

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