NCERT Book Class 10 Science Magnetic Effects of Electric Current Answers

Multiple Choice Questions

1. (c) 2. (c) Hint— Only earth’s magnetic field will be present.

3. (a) Hint— Misconception is that magnetic field lines point from north to south pole. The fact is that they emerge out of North pole and entre into South pole.

4. (c) 5. (a) 6. (c) 7. (d)

8. (d) AC frequency in India is 50 Hz. The direction changes twice in each cycle so that change of direction takes place after every 1/100 second.

9. (b) 10. (c) 11. (a) 12. (b)

Short Answer Questions

13. In the plane of the paper itself. The axis of the compass is vertical and the field due to the conductor is also vertical. It could result in a dip of compass needle which is not possible in this case (dips result only if axis of compass is horizontal). The deflection is maximum when the conductor through A is perpendicular to the plane of paper and the field due to it is maximum in the plane of the paper.

14. Hint— (i) The current through the solenoid should be direct current.(ii) The rod inside is made of a magnetic material such as steel.

15. Into the plane of paper at P and out of it at Q. The strength of the magnetic field is larger at the point located closer i.e. at Q.

16. The deflection increases. The strength of magnetic field is directly proportional to the magnitude of current passing through the straight conductor.

17. Hint— (i) Yes, Alpha particles being positively charged constitutes a current in the direction of motion. (ii) No. The neutrons being electrically neutral constitute no current.

Please refer to attached file for NCERT Class 10 Science Magnetic Effects of Electric Current Answers