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Figure 8 shows two straight conductors P and Q connected to a battery and a variable resistor.
PhyP2Q18b

  1. Using arrows, indicate on the diagram the direction of current that flows through P and Q when the switch is closed. 
  2. State what is observed as the current flows through the conductors. 
  3. Explain the observation in (2). 

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  1.   
    PhyP2A18b
    on the diagram
  2. The two conductors repel/ move away/ distance below conductors increases
  3. As the current flows, a magnetic field develops around each conductor such that the field between the conductor reinforce each other creating a stronger force.
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