CBSE Class 10 Science Chapter 12 Magnetic Effects of Electric Current Important Questions 2027
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23 questions from Magnetic Effects of Electric Current appeared in 7 of the 7 CBSE papers we analysed (2022–2026) — here are the topics that matter, the questions that repeat, and every previous-year question from this chapter.
Key facts
- Effects of Current unit — 13 marks in the official syllabus
- Asked in 7 of 7 analysed papers (2022–2026)
- About 3.3 questions per paper (OR alternatives counted separately)
- 6 question patterns repeated across papers
Important topics in Magnetic Effects of Electric Current
| # | Topic | Asked in | Importance |
|---|---|---|---|
| 1 | Magnetic field due to current (straight conductor / loop / solenoid) | Board 2022Board 2023Board 2024Board 2026Sample 2025Sample 2026 | ★★☆☆☆ |
| 2 | Field lines and right-hand / thumb rules | Board 2022Board 2023Board 2024Board 2025Board 2026 | ★★☆☆☆ |
| 3 | Domestic electric circuits, fuse and safety measures | Board 2023Board 2025 | ★☆☆☆☆ |
| 4 | Force on a current-carrying conductor and Fleming's Left Hand Rule | Board 2022Board 2023Board 2024Board 2026 | ★☆☆☆☆ |
Repeated questions from Magnetic Effects of Electric Current
1. Fleming's Left Hand Rule for force on a conductor
4×Board 2022Board 2023Board 2024Board 20262/3 marks
On the basis of the given circuit arrangement, answer the following questions: (a) What happens to the rod AB when the key K is closed and why? (b) Name and state the rule that determines this behaviour of the rod AB in the above situation.
2. Interpret field strength/direction around wire/loop
2×Sample 2025Sample 20263 marks
Magnetic field lines are shown in the given diagram (field lines around a current loop with points X and Y marked, near a magnet labelled N-S). A student makes a statement that the magnetic field at X is stronger than at Y. (i) Explain with reason if the student's claim is correct. (ii) Also redraw the diagram and mark the direction of magnetic field lines.
3. Draw magnetic field pattern of a bar magnet (and solenoid)
4×Board 2022Board 20231/2/3 marks
(i) Draw the pattern of magnetic field lines of (1) a current carrying solenoid (2) a bar magnet. (ii) List two distinguishing features between the two fields.
4. Magnetic field lines do not intersect (reason)
3×Board 2022Board 2024Board 20251/2 marks
Assertion (A): No two magnetic field lines are found to cross each other. Reason (R): The compass needle cannot point towards two directions at the point of intersection of two magnetic field lines. Select the correct answer: (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true, but R is not the correct explanation of A. (C) A is true, but R is false. (D) A is false, but R is true.
5. Increasing magnetic field strength of coil/electromagnet
2×Board 2023Board 20261/2 marks
How is an electromagnet made? Write any two ways by which the strength of electromagnet can be increased.
6. Solenoid magnetic field pattern (draw/identify)
2×Board 2022Board 20241/2 marks
The pattern of the magnetic field produced inside a current carrying solenoid is: [four field-pattern diagrams labelled (a), (b), (c), (d) are given as the options]
Magnetic Effects of Electric Current questions by paper
| Paper | Questions | Marks |
|---|---|---|
| Board 2022 | 6 | 10 |
| Board 2023 | 5 | 9 |
| Board 2024 | 3 | 6 |
| Board 2025 | 4 | 6 |
| Sample 2025 | 1 | 3 |
| Board 2026 | 3 | 6 |
| Sample 2026 | 1 | 3 |
Counts include both options of internal-choice (OR) questions.
Previous year questions: Magnetic Effects of Electric Current
Board 2026 3 questions
Assertion (A): With the help of compass, magnetic field lines can be traced outside the bar magnet. Reason (R): The north pole of a compass needle always points towards the south pole of the magnet when brought close to it. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
How is an electromagnet made? Write any two ways by which the strength of electromagnet can be increased.
On the basis of the given circuit arrangement, answer the following questions: (a) What happens to the rod AB when the key K is closed and why? (b) Name and state the rule that determines this behaviour of the rod AB in the above situation.
Sample 2026 1 question
Magnetic field lines are shown in the given diagram (field lines around a current loop with points X and Y marked, near a magnet labelled N-S). A student makes a statement that the magnetic field at X is stronger than at Y. (i) Explain with reason if the student's claim is correct. (ii) Also redraw the diagram and mark the direction of magnetic field lines.
Board 2025 4 questions
Assertion (A): No two magnetic field lines are found to cross each other. Reason (R): The compass needle cannot point towards two directions at the point of intersection of two magnetic field lines. Select the correct answer: (A) Both A and R are true and R is the correct explanation of A. (B) Both A and R are true, but R is not the correct explanation of A. (C) A is true, but R is false. (D) A is false, but R is true.
[Case: In our homes we receive electric power through mains (overhead poles or underground cables); the potential difference between the live wire and neutral wire of this supply is 220 V.] Write the colours of the insulation covers of the line wires through which supply comes to our homes.
[Case: Domestic mains supply at 220 V between live and neutral wires.] What is the function of the earth wire ? State the advantage of the earth wire in domestic electric appliances such as electric iron.
[Case: Domestic mains supply at 220 V between live and neutral wires.] List two precautions to be taken to avoid electrical accidents. State how these precautions prevent possible damage to the circuit/appliance.
Sample 2025 1 question
Mona was doing an experiment with a magnetic compass and a straight current-carrying wire (as shown in the given figure). She observed that as she moved the compass away from the current-carrying wire, the deflection of the compass needle reduced. A. Explain why the deflection of the compass needle reduced as Mona moved the compass needle away from the current carrying wire. B. Mention one thing that could have changed in the circuit of the wire that could increase the deflection of the needle. C. Explain with reason what will be the direction of the magnetic field associated with the wire for the case described by the above figure.
Board 2024 3 questions
The pattern of the magnetic field produced inside a current carrying solenoid is: [four field-pattern diagrams labelled (a), (b), (c), (d) are given as the options]
(i) Two magnetic field lines do not intersect each other. Why? (ii) How is a uniform magnetic field in a given region represented? Draw a diagram in support of your answer.
Name and state the rule to determine the direction of a: (i) magnetic field produced around a current carrying straight conductor. (ii) force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.
Board 2023 5 questions
In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have (a) higher power ratings such as geyser. (b) lower power ratings such as fan. (c) metallic bodies and low power ratings. (d) non-metallic bodies and low power ratings.
The resultant magnetic field at point 'P' situated midway between two parallel wires (placed horizontally) each carrying a steady current I is (a) in the same direction as the current in the wires. (b) in the vertically upward direction. (c) zero. (d) in the vertically downward direction. [Diagram shows two horizontal wires, upper wire A->B and lower wire C->D both carrying current in the same direction, with point P midway between them.]
Assertion (A): The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the number of turns in it. Reason (R): The current in each circular turn has the same direction and the magnetic field due to each turn then just adds up. Options: (a) Both (A) and (R) are true and (R) is the correct explanation of (A). (b) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (c) (A) is true, but (R) is false. (d) (A) is false, but (R) is true.
(i) State the rule used to find the force acting on a current carrying conductor placed in a magnetic field. (ii) Given below are three diagrams showing entry of an electron in a magnetic field. Identify the case in which the force will be (1) maximum and (2) minimum respectively. Give reason for your answer. [Three diagrams: (i) electron entering vertically (perpendicular) into a horizontal magnetic field; (ii) electron entering at an angle to the magnetic field; (iii) electron entering along (parallel to) the magnetic field.]
(i) Draw the pattern of magnetic field lines of (1) a current carrying solenoid (2) a bar magnet. (ii) List two distinguishing features between the two fields.
Board 2022 6 questions
[case context] A girl student fixes a white paper sheet on a drawing board using a sticky material. She places a bar magnet at its centre and, using a salt-sprinkler, uniformly sprinkles some iron filings around the bar magnet. On tapping the board gently she observes that the iron filings have arranged themselves in a particular pattern. Draw a diagram to represent this pattern of iron filings.
[case context] Iron filings sprinkled around a bar magnet on a tapped drawing board arrange into a pattern. Draw the magnetic field lines of a bar magnet. Show on it the poles of the bar magnet and the direction of the magnetic field lines.
(i) Name and state the rule to determine the direction of force experienced by a current carrying straight conductor placed in a uniform magnetic field which is perpendicular to it. (ii) An alpha particle while passing through a magnetic field gets projected towards north. In which direction will an electron project when it passes through the same magnetic field?
(i) What is a solenoid? (ii) Draw the pattern of magnetic field lines of the magnetic field produced by a solenoid through which a steady current flows.
[case context] Iron filings sprinkled around a bar magnet on a tapped drawing board arrange into a pattern. How is the direction of the magnetic field at a point determined using field lines? Why do two magnetic field lines not intersect each other?
[case context] Iron filings sprinkled around a bar magnet on a tapped drawing board arrange into a pattern. How are the magnetic field lines of a bar magnet drawn using a small compass? Draw one magnetic field line on each side of the magnet.
Frequently asked questions
What are the most important topics in CBSE Class 10 Science Chapter 12 Magnetic Effects of Electric Current?
By how often and how recently they were asked: Magnetic field due to current (straight conductor / loop / solenoid); Field lines and right-hand / thumb rules; Domestic electric circuits, fuse and safety measures.
How many marks does Magnetic Effects of Electric Current carry in the CBSE Class 10 Science exam?
Magnetic Effects of Electric Current is part of the Effects of Current unit, which carries 13 marks in the official syllabus. In the analysed papers it had about 3.3 questions per paper.
Do questions from Magnetic Effects of Electric Current repeat in board exams?
Yes — 6 question patterns from this chapter appeared in two or more past board or official sample papers. They are listed on this page with the years they were asked.