10 easy questions - mostly revision!

 1. What do magnetic field lines show?

  • A. The direction the south pole of a compass would point.
  • B. The direction the north pole of a compass would point.
  • C. The direction of force on a positive charge.
  • D. The direction of force on a negative charge.

2. At which point A to D on this diagram of a bar magnet is the magnetic field strongest?

4 locations around a bar magnet

3. A student tries drawing the field lines around a bar magnet. However some of the arrow directions are the wrong way round.

magnetic field lines with some incorrect

  

Which ones are incorrect?

  • A. green
  • B. blue
  • C. green and red
  • D. blue and green

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

Magnetic field lines diagrams x4

5. Which law will predict the direction of the field around the wire?

  • A. The left hand grip rule
  • B. The right hand grip rule
  • C. Fleming's left hand rule
  • D. Fleming's right hand rule

6+7: These questions are about magnetic fields inside a long empty coil of wire as shown. A current through the coil produces a magnetic field.

 air filled coil

6. What is the name of this coil?

  • A. A transformer
  • B. A potentiometer
  • C. A solenoid
  • D. An alternator

7. Which of the following correctly describes the magnetic field inside and outside the coil?

 Inside Outside
A
 strong uniform field same as a bar magnet
B
 strong uniform field same as a single wire
C
 no field same as a bar magnet
D
 no field same as a single wire

 

8.The diagram shows magnetic field lines.

What could have produced this field pattern?

 magnetic field lines from unknown source
  • A. A long coil of many turns
  • B. A single straight wire
  • C. A bar magnet
  • D. A single coil
9+10: The diagram shows a current carrying single coil placed in front of the north pole of a bar magnet. The direction of current is shown by the arrows.

Single coil in front of bar magnet

  

9. The magnetic field produced by the central part of the coil points...

  • A. upwards
  • B. downwards
  • C. towards the magnet
  • D. away from the magnet

10.The coil will be pushed/pulled...

  • A. upwards
  • B. downwards
  • C. towards the magnet
  • D. away from the magnet