Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-9702-EF3-0011 markL1 FoundationCalculatorElectric potential

Calculate the electric potential

0.30

m from a point charge of

+2.0

nC. (

\tfrac1{4\pi\varepsilon_0}=8.99\times10^9

N m² C⁻²)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0031 markL1 FoundationCalculatorElectric potential

Electric potential at a point is defined as the work done

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SA-9702-EF3-0041 markL1 FoundationCalculatorPotential gradient

Electric field strength is equal to

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0061 markL1 FoundationCalculatorPotential gradient

Equipotential surfaces around an isolated point charge are

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0081 markL1 FoundationCalculatorElectric potential

The distance from a point charge is doubled. State the factor by which the potential changes, as a decimal.

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SA-9702-EF3-0121 markL1 FoundationCalculatorPotential gradient

The work done moving a charge along an equipotential surface is

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SA-9702-EF3-0022 marksL2 StandardCalculatorElectric potential

An α-particle (charge

+2e

) has kinetic energy

8.0\times10^{-13}

J and travels head-on towards a gold nucleus (charge

+79e

). Calculate the distance of closest approach, in units of

10^{-14}

m. (

\tfrac1{4\pi\varepsilon_0}=8.99\times10^9

N m² C⁻²;

e=1.60\times10^{-19}

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0051 markL2 StandardCalculatorElectric potential

+3.0

μC charge is moved from a point at

50

V to a point at

250

V. Calculate the work done on it, in mJ.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0071 markL2 StandardCalculatorElectric potential

Charges of

+4.0

nC and

-2.0

nC are

0.20

m apart. Calculate the potential at the midpoint. (

\tfrac1{4\pi\varepsilon_0}=8.99\times10^9

N m² C⁻²)

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0091 markL2 StandardCalculatorPotential gradient

Two equipotentials of

120

V and

80

V are

2.0

cm apart in a uniform field. Calculate the field strength.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-EF3-0101 markL2 StandardCalculatorElectric potential

The electric potential near an isolated negative point charge is

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SA-9702-EF3-0113 marksL3 ExamCalculatorElectric potential

Two protons are held

2.0\times10^{-15}

m apart and released. Calculate the kinetic energy of each proton when they are very far apart, in units of

10^{-14}

J. (

\tfrac1{4\pi\varepsilon_0}=8.99\times10^9

N m² C⁻²;

e=1.60\times10^{-19}

Salam Academy Original Practice · Proposed mark scheme