Question 1

Paper 2Medium7 marks

A positive charge qq moves between the terminals of component P or component Q in the direction of conventional current. WW is the electrical work transferred to the component. For each component, the potential difference is constant during the measurements. Figure 1 shows measured values of WW for different values of qq Treat potential differences as magnitudes.

00.10.20.30.40.50.60.70.80.9100.511.522.533.544.5q / CW / J× P○ Q
(a)

Explain why the gradient of a graph of WW against qq represents the potential difference across a component.

[2]
(b)

Determine the potential difference across component P using Figure 1.

[2]
(c)

A positive charge of 0.60 C0.60\ \mathrm{C} passes through component Q. Determine the work transferred to Q. State which component transfers more energy per unit charge, and by what factor.

[3]

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