Edexcel IGCSE Physics: Double Science 复习笔记:6.1.4 Core Practical: Investigating Magnetic Fields

Edexcel IGCSE Physics: Double Science 复习笔记:6.1.4 Core Practical: Investigating Magnetic Fields

Core Practical 12: Investigating Magnetic Fields

 

Aim of the Experiment

  • To investigate the magnetic field pattern for a permanent bar magnet and between two bar magnets

 

 

 

Equipment List

 

Method

 

Step 1:

 

    • Place the magnet on top of a piece of paper
    • Draw a dot at one end of the magnet (near its corner)

     

 

Step 2:

    • Place a plotting compass next to the dot, so that one end of the needle of the compass points away from the dot
    • Use a pencil to draw a new dot at the other side of the compass needle

     

 

Step 3:

    • Move the compass so that it points away from the new dot, and repeat the process above

     

 

Step 4:

    • Keep repeating the previous process until there is a chain of dots going from one end of the magnet to the other
    • Then remove the compass, and link the dots using a smooth curve – this will be the magnetic field line

     

 

7.1.3-Direction-of-Magnetic-field-Step-4

 

Step 5:

    • Repeat the whole process several times to create several other magnetic field lines

     

7.1.3-Direction-of-Magnetic-field-Step-5

 

 

Step 6:

    • Repeat the whole process for two bar magnets placed 5 cm apart first facing the same pole then facing opposite poles

     

 

 

Analysis of Results

  • The magnetic field pattern for the single bar magnetic should look like this:

 

6.1.4-Direction-of-Magnetic-field-around-a-Bar-magnet

 

  • The magnetic field pattern for two bar magnets should look like this:

6.1.4-Magnetic-Field-around-two-Bar-Magnets

 

 

Evaluating the Experiment

  • Make sure the pencil you use is sharp to provide a clear and accurate drawing of the field lines
  • Read the marker on the compass from above and not at an angle
  • Allow the compasses to settle for a couple of seconds before taking the reading

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