A LevelPhysicsOCRExam Questions6. Particles & Medical PhysicsMagnetic Fields

Magnetic Fields (OCR A Level Physics): Exam Questions

Exam code: H556

23 mins8 questions

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Magnetic Fields

1
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A student is doing an experiment on the magnetic force experienced by a current-carrying wire in a uniform magnetic field. The magnetic flux density B can be varied.

For a particular flux density, the current in the wire is 2.0 A. The length of the wire in the field is 0.12 m. The angle between the current and the magnetic field is 30°. The force experienced by the wire is 7.7 × 10−2 N.

The student calculates B and records the results in a table.

Which row shows the correct table heading for B and the correct value for B?

 

Table heading for B

Value for B

A

B / T

0.37

B

B / T

0.64

C

B / Wb

0.37

D

B / Wb

0.64

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    2
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    The diagram shows four magnetic compasses placed at the same distance from point X.

    q9-paper-2-june-2019-ocr-a-level-physics

    Which of the following is most likely to be at point X?

    • permanent magnet

    • current-carrying solenoid

    • current-carrying flat coil

    • straight current-carrying wire

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    3
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    A charged particle moves in a circular path of radius 1.2 cm in a uniform magnetic field.

    q10-paper-2-june-2018-ocr-a-level-physics

    The direction of the magnetic field is perpendicular to the plane of the paper. The particle has mass m, charge +Q and speed v. Another particle of mass 3m, charge +2Q and speed v moves in a circular path of radius R in the same magnetic field.

    What is the value of R?

    • 0.8 cm

    • 1.2 cm

    • 1.8 cm

    • 7.2 cm

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    4
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    The acceleration of a proton as it travels perpendicular to a magnetic field is 1.6 × 1014 m s-2. The flux density of the magnetic field is 0.37 T.

    What is the velocity of the proton?

    • 4.5 space cross times space 10 to the power of 6 m s-1

    • 3.0 space cross times space 10 to the power of 8 m s-1

    • 2.5 space cross times space 10 cubed m s-1

    • 1.7 space cross times space 10 to the power of 6 m s-1

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    5
    1 mark

    What are the SI base units of magnetic flux density?

    • text kg s end text to the power of negative 2 end exponent text  A end text to the power of negative 1 end exponent

    • text kg m end text squared text  s end text to the power of negative 2 end exponent text  A end text to the power of negative 1 end exponent

    • text kg m s end text to the power of negative 3 end exponent text  A end text to the power of negative 1 end exponent

    • text kg m s end text to the power of negative 2 end exponent text  A end text to the power of negative 1 end exponent

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    6
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    A current-carrying wire is placed between the poles of a horseshoe magnet, which is placed on a top-pan balance, as shown.

    A U-shaped magnet on a digital balance. A wire is suspended between the poles of the magnet. The wire is labelled X on the left and Y on the right.

    The reading on the balance is 149.5 text  g end text when there is no current in the wire, and 151.9 text  g end text when there is a current of 3.0 text  A end text in the direction XY.

    When the current is increased to 4.0 text  A end text and the direction is reversed to YX, what is the reading on the balance?

    • 146.3 text  g end text

    • 147.1 text  g end text

    • 152.7 text  g end text

    • 155.1 text  g end text

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