International A Level (IAL)PhysicsEdexcelExam Questions4. Further Mechanics, Fields & ParticlesMagnetic Fields

Magnetic Fields (Edexcel International A Level (IAL) Physics): Exam Questions

Exam code: YPH11

1 hour16 questions

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Magnetic Fields

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1
1 mark

A coil of wire is connected to a resistor as shown.

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The magnetic flux density of the field through the coil is increased steadily from zero to a maximum value.

Which of the following single changes would result in a smaller current in the resistor?

  • increasing the area of the coil in the magnetic field

  • increasing the maximum flux density

  • increasing the number of turns on the coil

  • increasing the time taken to reach the maximum flux density

Choose your answer

2
1 mark

Which of the following is an equivalent unit to the weber?

  • N A m

  • N A m−1

  • N A−1 m

  • N A−1 m−1

Choose your answer

1
1 mark

The diagram shows a rectangular coil of N turns. The coil rotates around an axis as shown. A magnetic field acts perpendicular to the plane of the coil in the position shown.

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The magnetic flux linkage with the coil is Nϕ. The coil is rotated through an angle of π radians.

Which of the following is equal to the change in magnetic flux linkage with the coil?

  • 0

  • Nϕ2

  • Nϕ

  • 2Nϕ

Choose your answer

2
1 mark

The diagram shows a current‐carrying wire at an angle θ to a uniform magnetic field.

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Which of the following graphs shows how the force F on the wire varies as θ is increased from 0 to 90°?

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    Choose your answer

    3
    1 mark

    A square coil PQRS has sides of length l. There is a clockwise current I in the coil as shown. The plane of the coil is parallel to a magnetic field of magnetic flux density B.

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    Which row of the table is correct?

     

    Side of coil

    Magnetic force

    A

    PQ

    0

    B

    QR

    0

    C

    RS

    BIl into page

    D

    SP

    BIlout of page

      Choose your answer

      4
      1 mark

      A proton travelling at speed v enters a magnetic field of magnetic flux density 5.00 T, as shown.

      q9-wph14-04-june-2021-edexcel-int-as-and-a-level-phy

      A force of 1.20 × 10–11 N is exerted on the proton.

      Which of the following gives the speed of the proton in m s–1?

      • 1.20 × 10−115.00 ×1.67 × 10−27

      • 1.20 × 10−115.00 ×1.60 × 10−19

      • 5.00 ×1.67 × 10−271.20 × 10−11

      • 5.00 ×1.60 × 10−191.20 × 10−11

      Choose your answer

      5
      1 mark

      A rectangular coil has sides of length l and width w and carries a current I. The plane of the coil is parallel to a magnetic field of flux density B, as shown.

      Rectangular coil between two bar magnets. Coil corners labelled Y (top-left), X (top-right), Z (bottom-left), W (bottom-right). Horizontal top edge YX and bottom edge ZW each have length w; vertical sides YZ and XW each have length l. A bar magnet with N pole faces the coil from the left; another with S pole faces it from the right — so the magnetic field points horizontally from N to S, parallel to YX and ZW. The coil is connected to a battery via a split-ring commutator and brushes.

      Which row of the table gives the magnetic force on the named side of the coil?

      Side

      Magnetic force

      A

      YX

      BIw to the right

      B

      XW

      BIl to the left

      C

      WZ

      BIw upwards

      D

      ZY

      BIl downwards

        Choose your answer

        6
        1 mark

        A proton moves horizontally to the right towards a region of uniform magnetic field, as shown.

        A proton, drawn as a small circle labelled with a plus sign, moving to the right towards a square region of uniform magnetic field. The field into the page is shown as a grid of cross symbols.

        The magnetic field is directed into the page.

        Which of the following gives the direction of the force on the proton as it enters the magnetic field?

        • into the page

        • out of the page

        • upwards, in the plane of the page

        • downwards, in the plane of the page

        Choose your answer