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PHYSICS, M4 2020 VCE 1

Two bar magnets are placed close to each other, as shown in Figure 1.

Sketch the shape and the direction of at least four magnetic field lines between the two poles within the dashed border shown in Figure 1.  (2 marks)
 

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PHYSICS, M4 2021 VCE 1

Two identical bar magnets of the same magnetic field strength are arranged at right angles to each other and at the same distance from point \(\text{P}\), as shown in Figure 1.
 

  1. At point \(\text{P}\) on Figure 1, draw an arrow indicating the direction of the combined magnetic field of the two bar magnets.  (1 mark)

  2. Calculate the magnitude of the combined magnetic field strength of the two bar magnets if each bar magnet has a magnetic field strength of 10.0 mT at point \(\text{P}\).  (2 marks)

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a. 
           

b.     \(\text{14.1 mT} \)

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a. 
           
♦ Mean mark (a) 39%.

 
b.   \(\text{Using Pythagoras:}\)

\(\text{Magnetic field strength}\) \(=\sqrt{(10.0 \times 10^{-3})^2 + (10.0 \times 10^{-3})^2}\)  
  \(=\sqrt{2 \times 10^{-4}}\)  
  \(=14.1 \times 10^{-3}\ \text{T}\)  
  \(=14.1\ \text{mT}\)  
♦♦ Mean mark (b) 33%.