Electric Potential Flashcards | A-Level Physics OCR

What is the unit of electric potential?

The unit of electric potential is the volt (V).

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What happens to the electric potential as we move closer to a positive charge?

As we move closer to a positive charge, the electric potential increases.

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What happens to the electric potential as we move away from a positive charge?

As we move away from a positive charge, the electric potential decreases.

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What is the definition of electric potential?

Electric potential is the amount of electric potential energy per unit of charge.

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Where is the electric potential zero?

Electric potential is zero at infinity.

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What is electric potential difference?

Electric potential difference is the change in potential energy per unit charge as a charge is moved from one point to another in an electric field.

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What are equipotentials?

Equipotentials are lines or surfaces over which the electric potential is constant.

Equipotentials are always perpendicular to electric field lines.

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What is the work done when moving along an equipotential?

Zero

No work is done when moving along an equipotential.

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What is the formula linking work done (W), charge (Q) and electric potential difference (V)?

ΔW = QΔV

W = work done (J)

Q = charge (C)

$\Delta$ V = electric potential difference (V)

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What is the formula linking electric potential (V), permittivity of free space ( $\epsilon$ ₀), charge (Q), and distance (r)?

V = 4πϵ01rQ

V = electric potential (V)

$\epsilon$ ₀= permittivity of free space (F m^-1)

Q = charge (C)

r = distance from charge (m)

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