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A LevelPhysicsEdexcelExam Questions7. Electric & Magnetic FieldsCapacitance

Capacitance (Edexcel A Level Physics): Exam Questions

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Capacitance

1
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A capacitor is connected to a power supply and charged to a potential difference V0.

The graph shows how the potential difference V across the capacitor varies with the charge Q on the capacitor.

q9-nov-2021-9ph0-01-edexcel-as-a-level-phy

At a potential difference V0 a small charge ∆Q is added to the capacitor. This results in a small increase in potential difference ∆V across the capacitor.

Which of the following gives the approximate increase in energy stored on the capacitor due to this extra charge?

  • increment V space cross times space increment Q

  • fraction numerator increment V space cross times space increment Q over denominator 2 end fraction

  • V subscript 0 space cross times space increment Q

  • fraction numerator V subscript 0 space cross times space increment Q over denominator 2 end fraction

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2
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A capacitor of capacitance C is discharged through a resistor of resistance R.

The initial discharge current is I subscript 0.

Which of the following expressions gives the current after a time equal to RC?  

  • I subscript 0 over e

  • I subscript 0 over 2

  • I subscript 0 e to the power of negative R C end exponent

  • I subscript 0 space ln space 1 over e

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