Electromagnetism

Physics, SSC-Punjab Class 10. This chapter is split into 36 topics and has 756 practice questions. The topics covered are listed below, followed by 10 free sample questions from the chapter.

Topics in this chapter

1. Field Direction Scenarios for Straight Wires 21 questions
2. Magnetic Field Pattern Around a Straight Wire 21 questions
3. Split-Ring Commutator and Brushes 21 questions
4. Electric Motor Basics 21 questions
5. Dot and Cross Convention 21 questions
6. Force on a Current-Carrying Conductor in a Magnetic Field 21 questions
7. Factors Affecting the Strength of an Electromagnet 21 questions
8. Forces on Parallel Current-Carrying Conductors 21 questions
9. Earth's Magnetic Field 21 questions
10. Electromagnetism Multiple Choice Practice 21 questions
11. Origin of Earth's Magnetic Field 21 questions
12. Working of a D.C. Motor 21 questions
13. Properties of Magnetic Field Lines 21 questions
14. Fleming's Left-Hand Rule Scenarios 21 questions
15. Scope of Electromagnetism 21 questions
16. Factors Increasing the Turning Effect of a Coil 21 questions
17. Working of a Relay 21 questions
18. Force on a Wire Numericals Finding the Force 21 questions
19. Parts of a Relay 21 questions
20. Turning Effect on a Current-Carrying Coil 21 questions
21. Orsted and the Magnetic Effect of Current 21 questions
22. The Tesla Unit of Magnetic Field 21 questions
23. Applications and Integrated Scenarios in Electromagnetism 21 questions
24. Electromagnetism Short and Constructed Response Items 21 questions
25. Magnetic Poles and Magnets Review 21 questions
26. Right-Hand Grip Rule for a Straight Wire 21 questions
27. Magnetic Field Due to a Solenoid 21 questions
28. Parallel Wire Force Scenarios 21 questions
29. Force on a Wire Numericals Finding B I and L 21 questions
30. Electromagnets and Their Uses 21 questions
31. Right-Hand Rule for a Solenoid 21 questions
32. Fleming's Left-Hand Rule 21 questions
33. The Loudspeaker 21 questions
34. Effect of Changing the Current on the Field 21 questions
35. Force on a Wire at an Angle to the Field 21 questions
36. The Force Equation F = ILB sin(theta) 21 questions

Sample questions: Electromagnetism

10 sample questions with the correct answer and an explanation. Try to answer each one before reading the explanation.

Q1. What is the effect on the field at a point if current doubles and distance doubles?

• A. The field becomes half
• B. The field remains about the same(correct answer)
• C. The field becomes double of its earlier value
• D. The field becomes zero

Answer: B.Stronger current compensates the weaker field at greater distance (standard knowledge, B is proportional to I/d).

Q2. A long straight wire's current flows towards the south. Using the right-hand grip rule, in which direction does the magnetic field point at a point directly below the wire?

• A. Downward
• B. Towards the west
• C. Towards the south
• D. Towards the east(correct answer)

Answer: D.Thumb along the current (south); at the point directly below the wire the curled fingers point towards the east.

Q3. A long straight wire's current flows vertically downward. Using the right-hand grip rule, in which direction does the magnetic field point at a point to the north of the wire?

• A. Downward
• B. Towards the east(correct answer)
• C. Towards the north
• D. Towards the west

Answer: B.Thumb along the current (down); at the point to the north of the wire the curled fingers point towards the east.

Q4. A long straight wire's current flows towards the north. Using the right-hand grip rule, in which direction does the magnetic field point at a point directly below the wire?

• A. Towards the east
• B. Towards the west(correct answer)
• C. Downward
• D. Towards the north

Answer: B.Thumb along the current (north); at the point directly below the wire the curled fingers point towards the west.

Q5. A long straight wire's current flows towards the south. Using the right-hand grip rule, in which direction does the magnetic field point at a point directly above the wire?

• A. Upward
• B. Towards the west(correct answer)
• C. Towards the south
• D. Towards the east

Answer: B.Thumb along the current (south); at the point directly above the wire the curled fingers point towards the west.

Q6. A long straight wire's current flows vertically downward. Using the right-hand grip rule, in which direction does the magnetic field point at a point to the south of the wire?

• A. Downward
• B. Towards the west(correct answer)
• C. Towards the south
• D. Towards the east

Answer: B.Thumb along the current (down); at the point to the south of the wire the curled fingers point towards the west.

Q7. A long straight wire's current flows vertically downward. Using the right-hand grip rule, in which direction does the magnetic field point at a point to the east of the wire?

• A. Towards the east
• B. Towards the south(correct answer)
• C. Downward
• D. Towards the north

Answer: B.Thumb along the current (down); at the point to the east of the wire the curled fingers point towards the south.

Q8. A long straight wire's current flows towards the north. Using the right-hand grip rule, in which direction does the magnetic field point at a point directly above the wire?

• A. Upward
• B. Towards the east(correct answer)
• C. Towards the west
• D. Towards the north

Answer: B.Thumb along the current (north); at the point directly above the wire the curled fingers point towards the east.

Q9. A long straight wire's current flows towards the west. Using the right-hand grip rule, in which direction does the magnetic field point at a point directly below the wire?

• A. Towards the south(correct answer)
• B. Downward
• C. Towards the west
• D. Towards the north

Answer: A.Thumb along the current (west); at the point directly below the wire the curled fingers point towards the south.

Q10. A long straight wire's current flows towards the east. Using the right-hand grip rule, in which direction does the magnetic field point at a point directly below the wire?

• A. Towards the north(correct answer)
• B. Towards the south
• C. Towards the east
• D. Downward

Answer: A.Thumb along the current (east); at the point directly below the wire the curled fingers point towards the north.