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

Magnetic Fields (Edexcel International A Level Physics)

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1
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*A student carried out an investigation of Lenz’s law. A copper tube was suspended from a force meter, as shown.

A magnet was released at the top of the tube. When the magnet was falling through the tube, there was an increased reading on the force meter.

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Explain why there was an increased reading on the force meter.

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1
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A music system has a number of loudspeakers. One loudspeaker produces the low frequency sounds. This loudspeaker consists of a coil connected to a cone. The coil is in a region of magnetic field produced by a permanent magnet, as shown.

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Explain how an alternating current in the coil causes the cone to oscillate with the frequency of the alternating current.

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2a
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A carriage on a roller coaster ride travels along a horizontal track towards a vertical tower, as shown.

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The carriage starts from rest. A force of 109 kN acts on the carriage for 2.9 s. The carriage then moves up a vertical tower of height 81 m.

i)
Show that the velocity of the carriage is about 40 m s–1 as it leaves the horizontal track.

total mass of carriage and people = 7500 kg
(2)
ii)
Deduce whether this velocity is enough for the carriage to reach the top of the tower.

Assume that resistive forces are negligible.

(3)

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2b
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Just before the carriage reaches the end of the ride it is slowed by an electromagnetic brake. Powerful magnets are attached to the track. An aluminium fin is attached to the carriage. The fin moves through a narrow gap between the magnets.

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Explain why the fin will leave the gap with a much slower speed than it entered the gap.

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3a
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Faraday’s law can be written as xi space equals space fraction numerator negative d open parentheses N ϕ close parentheses over denominator d t end fraction

State the name of the term N ϕ and its unit.

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3b
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A coil of 500 turns and radius 3.0 mm is placed between two poles of an electromagnet as shown. The terminals are connected to an a.c. power supply.

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The magnetic flux density B perpendicular to the plane of the coil varies with time t as shown below.

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Determine the maximum e.m.f. across the coil.







Maximum e.m.f. = ..............................

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3c
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Some electric motor designs rely on electromagnetic induction.

A laboratory demonstration of the principle of an induction motor is shown.
An aluminium disc is free to rotate and is initially stationary. A powerful magnet is moved around the disc in the direction of the arrow, without touching the disc.

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A student suggests that the disc will start to rotate as the magnet is moved and that the disc will rotate in the same direction as the movement of the magnet.

Discuss this suggestion.

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4a
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In 1821, Michael Faraday made what is believed to be the first electric motor.

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The stiff wire was suspended freely from a stand. The mercury completed an electrical circuit, which included the wire. When there was a current in the wire, the wire moved around the magnet.

The wire made 10 complete revolutions around the magnet in a time of 8.3 s.
   Calculate the angular velocity of the wire.




Angular velocity = .....................................

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4b
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When the current in the wire is 1.1 A, the wire is at an angle of 10° to the vertical. 

The length of the wire in the horizontal magnetic field is 3.5 cm.

q11b-wph14-04-june-2021-edexcel-int-as-and-a-level-phy

Determine the force on the wire. 
magnetic flux density = 0.053 T




Magnitude of force on wire = .......................................
Direction of force on wire = ......................................

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