⚛️ Physics Quiz 17: Electric Potential and Capacitance

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⚛️ Physics · Quiz 017

Move from force-per-charge field reasoning to energy-per-charge potential and charge storage.

Learning goalInterpret electric potential as a scalar, calculate point-charge potential, and use C = Q/V and capacitor-energy relationships.

  • 5 questions
  • Foundation
  • Explanations after finishing
Answered 0/5
FoundationWhat does electric potential difference between two points measure?
Need a small nudge?

Potential difference is an energy-per-charge quantity.

UnderstandingWhy is electric potential often easier to add for several point charges than electric field?
Need a small nudge?

Compare the mathematical type of V with the mathematical type of E.

ApplicationWhat is the electric potential 0.50 m from an isolated point charge +2.0 microC in vacuum, taking zero potential at infinity? Use k = 8.99 x 10^9 N m^2/C^2.
Need a small nudge?

Use V = kQ/r and retain the sign of the source charge.

InterpretationAn ideal capacitor with fixed capacitance C remains connected to a voltage source. The applied voltage is doubled. How do the stored charge Q and stored energy U change?
Need a small nudge?

Use Q = CV and U = (1/2)CV^2 with C fixed.

ConnectionA 6.0 microF capacitor and a 3.0 microF capacitor are connected in parallel across an ideal 12 V source. Which pair is correct for the equivalent capacitance and total charge supplied to the pair?
Need a small nudge?

Parallel capacitors share the same voltage and their capacitances add.

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