µ GCSE | Motor Effect

10 quick questions - for GCSE and iGCSE

 

10 minutes maximum! (can you do it in 5?)


 1. Which of these diagrams shows the magnetic field line pattern (red lines) around a single straght wire carrying a current?

 

Q 2-4. The diagram below shows a copper wire between 2 magnets.

 

2. In which direction is the magnetic field?

  • A. N to S
  • B. S to N
  • C. A to B
  • D. B to A

3. If we want the wire to be pushed upwards, which way must current flow?

  • A. N to S
  • B. S to N
  • C. A to B
  • D. B to A

4. If we want the wire to be pushed to the right, which way must current flow?

  • A. A to B
  • B. B to A
  • C. Use an alternating current.
  • D. It is not possible using a current.

 

     

Q5&6. The magnets and wire are re-arranged. A current flows in the wire as show by the arrow.

 

5. In which direction will this wire be pushed?

  • A. To the left.
  • B. To the right.
  • C. Upwards.
  • D. Downwards.

 

 

6. What could be done to push the wire in the opposite direction, with twice the force?

  • A. Switch the N and S poles of the magnets round.
  • B. Double the current.
  • C. Switch the direction of the current AND the N and S poles.
  • D. Double the current AND switch the N and S poles.

 

Q7-9. A long coil is made to increase the magnetic field as shown here.

 

 

7. What is this coil called?

  • A. A magnocoil.
  • B. An induced field.
  • C. A solenoid.
  • D. A potentiometer.

8. Where is the magnetic field strongest?

  • A. In the centre of the coil.
  • B. Just outside the coil, near to one end.
  • C. Just outside the coil, in the centre.
  • D. Near to the bare wire terminals.

9. There are many ways the field outside the coil can be made stronger. Which one of these will not work?

  • A. Increase the current in the coil.
  • B. make the wires thinner, with the same number of turns.
  • C. Increase the number of turns in the coil in the same length.
  • D. Put a soft iron core in the middle.

 

 

10. This coil of wire has a current flowing through it which makes the coil move.

 

Which way does the coil move?

  • A. To the left.
  • B. To the right.
  • C. Rotates clockwise.
  • D. Rotates anti-clockwise.