Class 10 Magnetic effects of current

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Very Short Answer Type Questions:

  1. What is a magnet?
  2. What is a permanent magnet?
  3. What is a temporary magnet?
  4. What is an electromagnet?
  5. What is the direction of magnetic field lines?
  6. What is the shape of magnetic field lines due to a straight current-carrying conductor?

Fill in the blanks:

  1. A microphone works on ……………..effect of electric current.
  2. There are ……………poles in a magnet.
  3. A freely suspended bar magnet always points to ……………..direction when it is in rest.
  4. The north pole of a bar magnet is called the ………….seeking pole.
  5. The south pole of a bar magnet is called the ………………..seeking pole.
  6. ……………poles of two magnets repel each other.
  7. ……………..poles of two magnets attract each other.

Write True/False for the following:

  1. Natural magnets are permanent magnets.
  2. All current-carrying conductors may not produce the magnetic effect.
  3. All electromagnets are solenoids.
  4. Electromagnetism is responsible for working with speakers.
  5. A solenoid creates the uniform magnetic field.
  6. Magnetic strength decreases with increase in current.
  7. Magnetic strength increases with increase in a number of turns in the coil in the solenoid.

Answer: 1 → T, 2→ F, 3 → F, 4 → T, 5 → T, 6 → F, 7 → T

Short Answer Type Questions:

  1. Write any three uses of the magnet.
  2. How does the pattern of magnetic field lines show that magnetic field is stronger near a magnet but weaker away from it?
  3. What is the relationship between the direction of electric current and that of magnetic field lines?
  4. Briefly, explain the Right-Hand Thumb Rule.
  5. Briefly, explain Maxwell’s Corkscrew Rule.

Long Answer Type Questions:

  1. What are the properties of magnetic field lines?
  2. Comment on magnetic field lines due to a straight current-carrying conductor.

Multiple Choice Questions

  1. Which of the following works on magnetic effect of electric current?
  • a. Microphone
  • b. Speaker
  • c. CD drive
  • d. All of the above
  1. What is the shape of magnetic field lines near a bar magnet?
  • a. Concentric lines
  • b. Parallel lines
  • c. Zig-zag lines
  • d. Wavy lines
  1. What is the shape of magnetic field lines in the centre of a current-carrying loop?
  • a. Concentric lines
  • b. Straight lines
  • c. Wavy lines
  • d. Zig-zag lines
  1. What is the shape of a solenoid?
  • a. Cylinder
  • b. Circle
  • c. Helix
  • d. Spherical

Brainstorming Session

  1. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current-carrying solenoid with the help of a bar magnet? Explain.
  2. A magnetic compass shows a deflection when placed near a current-carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason. (NCERT)

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