Class 8 Electricity: Magnetic and Heating Effects worksheet

Sample questions

Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.

Section A · multiple choice

1. 1.

   A compass needle placed near a wire moves when current flows because:

   1. the needle gets hot
   2. the wire is heavy
   3. the wire gets wet
   4. the current produces a magnetic field

   Answer

   (d) the current produces a magnetic field

   Oersted, 1820

2. 2.

   An electromagnet is made with a plastic tube instead of an iron core. Compared with before, it becomes:

   1. weaker
   2. only hot, not magnetic
   3. non-magnetic even when on
   4. a permanent magnet

   Answer

   (a) weaker

3. 3.

   Which of these works mainly on the HEATING effect of current?

   1. a ceiling fan's motor
   2. an electric bell
   3. a kettle
   4. a compass needle near a wire

   Answer

   (c) a kettle

Section B · short answer

1. 4.

   What did Oersted discover?

   Answer

   An electric current produces a magnetic field (a compass needle moves near a current-carrying wire).

2. 5.

   Does the electromagnet become "stronger" or "weaker" with (a) more cells (b) the iron nail removed from inside the coil?

   Answer

   (a) stronger (b) weaker

Section C · long answer

1. 6.

   Describe how to make an electromagnet and test its strength.

   Answer

   Wind about 50 turns of insulated wire around an iron nail, connect the ends to a cell through a switch, and close the switch. Count how many paper clips it picks up. Try more turns or more cells and count again: more turns or current pick up more clips.

Fresh sheets for your child

In the app, every Electricity: Magnetic and Heating Effects sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.

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