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Chapter 7 Practice Paper: Magnetism and Electromagnetism — question paper

QuizQuipPractice Series
QQ/S4CPH/CH7

Secondary 4 · Combined Science (Physics) (G2 / G3)

Chapter 7 Practice Paper

Magnetism and Electromagnetism

Duration: 40 minutes
Total: 30 marks
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Class:
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Date:

READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • The acceleration of free fall near the Earth is 10 m/s².
  • The speed of sound in air is 340 m/s unless stated otherwise.
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Physics) syllabus. It is not an official MOE or school examination paper. Chapter 7 (magnet properties and induced magnetism; compass direction and bar-magnet field patterns; fields of straight wires and solenoids with current changes; force on a current-carrying conductor and its reversals; Fleming’s left-hand rule; turning effect on a coil).

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Which pair of materials is magnetic?

    1. Acopper and zinc
    2. Biron and steel
    3. Caluminium and brass
    4. Dplastic and wood
    ( )
  2. 2

    Magnetic attraction is strongest

    1. Aat the middle of the magnet
    2. Buniformly everywhere
    3. Cat the north pole only
    4. Dat the two poles
    ( )
  3. 3

    The magnetic field lines outside a bar magnet run

    1. Afrom the N pole to the S pole
    2. Bfrom the S pole to the N pole
    3. Cin circles around the middle
    4. Dinwards at both ends
    ( )
  4. 4

    A current-carrying wire lies at right angles to a magnetic field. Reversing the current only will

    1. Anot change the force
    2. Breverse the force
    3. Cdouble the force
    4. Dstop the force
    ( )
  5. 5

    In Fleming’s left-hand rule, the thumb shows the direction of the

    1. Amagnetic field
    2. Bcurrent
    3. Cforce (motion)
    4. Dp.d.
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A bar magnet is dipped into a box of iron pins and lifts a chain of pins hanging from its N pole.

    1. (a)

      State what magnetism the pins acquire and which pole each pin’s touching end becomes.

      [2]
    2. (b)

      The pins fall off as soon as the magnet is removed. State what this shows about the pins’ magnetism, and name the magnetic material category they belong to.

      [2]
    3. (c)

      A steel paperclip holds its magnetism after removal. State its category and one use of such a material.

      [2]
  2. 2

    A student makes an electromagnet by winding 200 turns of insulated copper wire around an iron nail and connecting the ends to a battery and a switch.

    1. (a)

      Describe the magnetic field produced when the switch is closed.

      [2]
    2. (b)

      State three ways the student could make the electromagnet stronger.

      [3]
    3. (c)

      Explain why the nail’s ends behave as poles, and state what happens to them if the battery is reversed.

      [2]
  3. 3

    A stiff copper wire is clamped between the poles of a strong magnet, with the wire at right angles to the field. The wire is connected through a switch to a battery so the current flows horizontally through it.

    1. (a)

      Describe what happens when the switch is closed, and name the rule that predicts the direction of the effect.

      [3]
    2. (b)

      State and explain what is observed when (i) the battery is reversed, (ii) the magnet’s poles are swapped, (iii) both are reversed at once.

      [3]
    3. (c)

      State two changes, other than reversals, that would increase the size of the force.

      [1]

— End of paper —