Edexcel International A Level Physics

Topic Questions

International A LevelPhysicsEdexcelTopic Questions4. Further Mechanics, Fields & ParticlesMagnetic Fields

Magnetic Fields

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1
Sme Calculator1 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

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1
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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.

q5-wph14-04-oct-2021-edexcel-int-as-and-a-level-phy

The magnetic flux linkage with the coil is N ϕ. The coil is rotated through an angle of straight pi radians.

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

  • 0

  • fraction numerator N ϕ over denominator 2 end fraction

  • N ϕ

  • 2 N ϕ

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2
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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°?

q10-1-wph14-04-oct-2021-edexcel-int-as-and-a-level-phy

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3
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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 BIl out of page

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4
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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?

  • fraction numerator 1.20 space cross times space 10 to the power of negative 11 end exponent over denominator 5.00 space cross times 1.67 space cross times space 10 to the power of negative 27 end exponent end fraction

  • fraction numerator 1.20 space cross times space 10 to the power of negative 11 end exponent over denominator 5.00 space cross times 1.60 space cross times space 10 to the power of negative 19 end exponent end fraction

  • fraction numerator 5.00 space cross times 1.67 space cross times space 10 to the power of negative 27 end exponent over denominator 1.20 space cross times space 10 to the power of negative 11 end exponent end fraction

  • fraction numerator 5.00 space cross times 1.60 space cross times space 10 to the power of negative 19 end exponent over denominator 1.20 space cross times space 10 to the power of negative 11 end exponent end fraction

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