11 mark
Which pair of objects attract each other?
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Magnets & Magnetic Fields (OCR GCSE Combined Science A (Gateway): Physics): Exam Questions
Exam code: J250
53 mins15 questions
21 mark
Which does not increase the magnetic effect of a solenoid?
Increasing the cross-sectional area of the solenoid
Increasing the current in the solenoid
Increasing the number of turns on the solenoid
Putting a soft iron core in the solenoid
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31 mark
Which action increases the strength of an electromagnet?
Decreasing the current
Decreasing the number of turns of wire
Increasing the number of turns of wire
Using a copper core
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41 mark
The different currents in four wires are shown below. The magnetic field is measured at positions A, B, C and D.
Which position will experience the strongest magnetic field?
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51 mark
A magnet is used to pick up a paperclip.
Which statement explains why the paperclip is picked up?
The magnet is a permanent magnet and the opposite pole has been induced at the top of the paperclip.
The magnet is a permanent magnet and the same pole has been induced at the top of the paperclip.
The magnet is a temporary magnet and the opposite pole has been induced at the top of the paperclip.
The magnet is a temporary magnet and the same pole has been induced at the top of the paperclip.
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61 mark
The diagram shows a wire carrying an electric current.
Which diagram shows the magnetic field viewed from above, with the current coming towards you?
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71 mark
In a solenoid, a magnetic field is generated when an electric current passes through a coiled wire.
Which row shows how increasing the current or increasing the number of turns in the coiled wire affects the strength of the magnetic field?
|
| Increased current | Increased number of turns |
A | Effect on magnetic field strength | stronger | weaker |
B | stronger | stronger | |
C | weaker | stronger | |
D | weaker | weaker |
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81 mark
Why is an unmagnetised piece of iron attracted to a magnet?
The iron has charged particles which attract the electrons in the magnet.
The iron has charged particles which attract the protons in the magnet.
The iron has magnetism induced by the magnet.
The iron is attracted by the Earth’s magnetic field.
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91 mark
A student has a collection of metal bars that keep sticking to each other. She suspects that they might be magnets, so she runs a test.
She holds end V of rod 1, near to each end of the two other rods. The ends are shown in the diagram below.
Her results are as follows:
End V:
Repels end W
Attracts end X
Attracts end Y
Attracts end Z
Which of the metal rods is a magnet?
1 and 2
2 and 3
1 only
2 only
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101 mark
A student wants to make an electromagnet that acts like a permanent magnet that will retain its magnetism after it is switched off. The student is using some easy-to-find materials that are in the school lab.
Which metal should the student use as the core inside the coil, and which setting on the power supply?
| Metal | Power supply setting |
A | soft iron | 6V a.c. |
B | steel | 6V a.c. |
C | soft iron | 6V d.c. |
D | steel | 6V d.c. |
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