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

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

Exam code: YPH11

57 mins13 questions

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Magnetic Fields

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1
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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

1
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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

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2
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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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    3
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    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
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      1 mark

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

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      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