Which pair of magnetic poles will attract each other?
A north pole and a south pole
A north pole and a north pole
A south pole and a south pole
Two unmagnetised iron bars
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WhyUnlike poles attract; like poles repel. A north pole and a south pole are unlike, so they attract.
2Multiple choice · Easy
Which of these is a magnetic material that is attracted to a magnet?
Iron
Copper
Aluminium
Plastic
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WhyIron is a magnetic material (along with steel, cobalt and nickel) and is attracted to magnets. Copper, aluminium and plastic are not magnetic.
3Multiple choice · Easy
In what direction does a magnetic field line point?
From the north pole to the south pole
From the south pole to the north pole
Always towards the nearest pole
In a straight line between the two poles only
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WhyBy convention, magnetic field lines run from the north pole to the south pole outside the magnet.
4Multiple choice · Easy
What is the difference between a permanent magnet and an induced magnet?
An induced magnet is only magnetic while in a magnetic field, but a permanent magnet always is
A permanent magnet is only magnetic while in a magnetic field
Induced magnets are always stronger than permanent magnets
There is no difference between them
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WhyA permanent magnet produces its own field all the time, while an induced magnet only becomes magnetic when placed in a magnetic field and quickly loses most of its magnetism when removed.
5Multiple choice · Easy
Which instrument uses a small bar magnet that lines up with the Earth's magnetic field?
A compass
A thermometer
An ammeter
A barometer
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WhyA compass contains a tiny bar magnet that is free to rotate and aligns with the Earth's magnetic field, showing that the Earth's core is magnetic.
6Fill in the blank · Easy
The force between two magnets that are not touching is an example of a force, because it acts without contact.
Answer:
non-contact / non contact / noncontact
WhyMagnetic forces are non-contact forces; they act over a distance without the objects needing to touch.
7Multiple choice · Medium
A current flows through a long straight wire. What is the shape of the magnetic field around the wire?
Concentric circles centred on the wire
Straight lines parallel to the wire
Straight lines pointing away from the wire
A single loop above the wire only
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WhyThe field around a straight current-carrying wire forms concentric circles centred on the wire, getting weaker further from the wire.
8Multiple choice · Medium
Which change will increase the strength of the magnetic field produced by a solenoid?
Adding an iron core inside the solenoid
Decreasing the current in the coil
Using fewer turns of wire
Replacing the wire with a thicker insulator
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WhyAdding an iron core, increasing the current, or increasing the number of turns per unit length all increase the field strength of a solenoid.
9Multiple choice · Medium
Why is the magnetic field inside a solenoid described as strong and uniform?
The fields from the individual turns add together to give parallel, evenly spaced field lines
The current inside is much larger than the current in the wire
The field lines cancel out completely inside
The iron core repels the field lines outwards
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WhyThe fields from each turn of wire add together inside the solenoid, producing a strong field with evenly spaced, parallel field lines (uniform).
10Multiple choice · Medium
A wire carrying a current sits at 90 degrees to a magnetic field. According to Fleming's left-hand rule, the thumb represents which quantity?
The force (motion)
The magnetic field
The current
The voltage
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WhyIn Fleming's left-hand rule the thumb shows the force (motion), the first finger the field, and the second finger the current.
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