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IGCSEPhysics: Co-ordinated Sciences (Double Award)CIEExam Questions4. Electricity & MagnetismElectromagnetic Effects

Electromagnetic Effects (CIE IGCSE Physics: Co-ordinated Sciences (Double Award))

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Electromagnetic Effects

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Electromagnetic Effects

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11 mark

Extended tier only

Which diagram shows the correct magnetic field pattern around a current-carrying solenoid?

q6---solenoid-field-pattern

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    21 mark

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    Which diagram correctly shows the magnetic field lines around a current-carrying wire if the current is directed out of the page?

    q2-easy-mcq-4-4-electromagnetic-effects-cie-igcse-physics

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      31 mark

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      Which device uses a split ring commutator?

      • d.c. motor

      • transformer

      • relay

      • a.c. generator

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      41 mark

      Extended tier only

      A simple d.c. electric motor is shown in the diagram.

      q10---dc-motor

      Which of the following changes would make the coil turn more quickly?

      • Reducing the strength of the magnetic field.

      • Reversing the direction of the current and swapping the magnetic poles.

      • Swapping the magnetic poles.

      • Increasing the current in the coil

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      51 mark

      Extended tier only

      The number of turns in the primary coil and secondary coil of a transformer is Np and Ns respectively.

      Which of the following statements represents a step-up transformer?

      • N subscript s space equals space N subscript p

      • N subscript s space greater than space N subscript p

      • N subscript s space less than space N subscript p

      • N subscript p space greater than space N subscript s

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      11 mark

      Extended tier only

      When a wire is moved through a magnetic field, an e.m.f. is induced in the wire.

      Which of the following devices uses this effect?

      • electric motor

      • electricity generator

      • photon accelerator

      • transformer

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      21 mark

      Extended tier only

      Which graph represents the output of a simple a.c. generator?

      q12---ac-generator-traces

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        11 mark

        Extended tier only

        Transformers are used to change the voltage of a power supply. 

        The diagram below shows a simple transformer.

        q2-transformer

        If the input voltage is 48 V, what is the output voltage?

        • 2.4 V

        • 9.6 V

        • 240 V

        • 667 V

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        21 mark

        Extended tier only

        A current-carrying wire is placed between two magnetic poles as shown in the diagram below. It experiences an upwards force.

        q4-hard-mcq-4-4-electromagnetic-effects-cie-igcse-physics

        What is the orientation of the magnetic poles?

         

        Left magnet

        Right magnet

        A

        N

        N

        B

        S

        N

        C

        N

        S

        D

        S

        S

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          31 mark

          Extended tier only

          A transformer is used to raise the voltage of electricity produced at a power station before it is transmitted in power lines.

          The power station generates electricity at a voltage of 25 kV and a current of 4000 A. The step-up transformer increases the voltage to 400 kV.

          Assume that the transformer is 100% efficient.

          What current flows in the power lines?

          • 0.25 A

          • 250 A

          • 640 A

          • 64 000 A

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          41 mark

          Extended tier only

          A transformer has 1200 turns on its secondary coil and has an output voltage of 240 V.

          q11---transformer-2

          If the input voltage is 12 V, how many turns are there on the primary coil?

          • 2

          • 60

          • 1200

          • 24 000

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          51 mark

          Extended tier only

          A current-carrying wire is placed into a magnetic field as shown in the diagram. The wire experiences a force.

          q14---motor-effect

          In which direction does the force on the wire act?

          • OP

          • PO

          • ST

          • QR

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