Practise

Question bank

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

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2730 questions · page 19 of 137 · choose a topic above to narrow them down

SA-9702-EC2-0021 markL1 FoundationCalculatorElectrical power

12

V supply drives a current of

2.5

A through a motor. Calculate the power.

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SA-9702-EC2-0031 markL1 FoundationCalculatorElectrical power

A current of

0.50

A flows through a

40

Ω resistor. Calculate the power dissipated.

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SA-9702-EC2-0051 markL1 FoundationCalculatorPotential difference

The potential difference across a component is

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SA-9702-EC3-0012 marksL1 FoundationCalculatorResistivity

A nichrome wire (

\rho=1.1\times10^{-6}

Ω m) is

2.0

m long with a cross-sectional area of

2.0\times10^{-7}

m². Calculate its resistance.

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SA-9702-EC3-0041 markL1 FoundationCalculatorResistivity

The SI unit of resistivity is

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SA-9702-EC3-0051 markL1 FoundationCalculatorI–V characteristics

As the temperature of an NTC thermistor increases, its resistance

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SA-9702-EF1-0011 markL1 FoundationCalculatorUniform fields

Two parallel plates

2.0

cm apart have a p.d. of

500

V. Calculate the field strength between them, in units of

10^4

V m⁻¹.

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SA-9702-EF1-0021 markL1 FoundationCalculatorElectric field strength

Calculate the force on an electron in a field of

2.5\times10^4

V m⁻¹, in units of

10^{-15}

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SA-9702-EF1-0041 markL1 FoundationCalculatorElectric field strength

Electric field strength at a point is defined as

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SA-9702-EF1-0051 markL1 FoundationCalculatorElectric field strength

The unit V m⁻¹ is equivalent to

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SA-9702-EF2-0021 markL1 FoundationCalculatorPoint charge field

A sphere carries

+2.0

nC. Calculate the field strength at

0.30

m from its centre. (

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

N m² C⁻²)

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SA-9702-EF2-0031 markL1 FoundationCalculatorCoulomb's law

The distance between two point charges is halved. State the factor by which the force between them changes.

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SA-9702-EF2-0041 markL1 FoundationCalculatorPoint charge field

The electric field strength inside a hollow charged conducting sphere is

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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)

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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

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SA-9702-FD1-0011 markL1 FoundationCalculatorMoments & couples

50

N force acts at right angles to a lever,

0.40

m from the pivot. Calculate its moment.

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SA-9702-FD1-0021 markL1 FoundationCalculatorMoments & couples

A couple consists of two

15

N forces whose lines of action are

0.20

m apart. Calculate the torque of the couple.

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SA-9702-FD1-0051 markL1 FoundationCalculatorEquilibrium

An object is in equilibrium when

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SA-9702-FD2-0011 markL1 FoundationCalculatorPressure

Convert a density of

2.7

g cm⁻³ into kg m⁻³.

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