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Cambridge IGCSE Physics practice

Paper 3 structured question: The d.c. motor

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The d.c. motor

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Paper 3Theory (Core)1 marks

A coil of wire is placed in a magnetic field and connected to a power source.

Description

Coil in a Magnetic Field

The coil has 100 turns and carries a current of 2 A in a magnetic field of strength 0.5 T.

  1. a

    State the factors that can increase the rotational force on the coil.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: The d.c. motor

Paper 3Theory (Core)3 marks

Description

Coil Characteristics

The magnetic field strength is 0.8 T.

  1. a

    Explain how increasing the number of turns in the coil affects the rotational force.

    Aim for approximately 3 distinct marking points.

    [3]