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-MF3-0011 markL1 FoundationCalculatorForces between wires

Two long parallel wires carry currents in the same direction. The wires

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SA-9702-MF3-0031 markL1 FoundationCalculatorField patterns

The magnetic field inside a long current-carrying solenoid is

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SA-9702-MF3-0041 markL1 FoundationCalculatorField patterns

Placing a soft iron core inside a solenoid

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SA-9702-MF3-0051 markL1 FoundationCalculatorField patterns

The rule used to find the direction of the magnetic field around a current-carrying wire is

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SA-9702-MF3-0081 markL1 FoundationCalculatorField patterns

The magnetic field outside a long solenoid resembles that of

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SA-9702-MF3-0091 markL1 FoundationCalculatorForces between wires

The currents in two parallel wires are both doubled. State the factor by which the force between them changes.

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SA-9702-MF3-0121 markL1 FoundationCalculatorForces between wires

Two parallel wires carry currents in opposite directions. They

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SA-9702-MF3-0022 marksL2 StandardCalculatorForces between wires

Wire 1 produces a field of

4.0\times10^{-5}

T at wire 2, which carries

5.0

A perpendicular to that field. Calculate the force on a

2.0

m length of wire 2, in units of

10^{-4}

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SA-9702-MF3-0061 markL2 StandardCalculatorForces between wires

Wire A carries

2

A and parallel wire B carries

6

A. Compared with the force on A, the force on B is

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SA-9702-MF3-0071 markL2 StandardCalculatorField patterns

Field lines around a long straight wire get further apart with distance because

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SA-9702-MF3-0101 markL2 StandardCalculatorField patterns

A current flows anticlockwise around a flat coil as seen from the front. The face you are looking at is

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SA-9702-MF3-0112 marksL3 ExamCalculatorForces between wires

Two parallel wires repel with a force of

6.0\times10^{-5}

N per metre. The field from wire 1 at wire 2 is

2.0\times10^{-5}

T. Calculate the current in wire 2.

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