CIE iGCSE Co-Ordinated Science P4.1 Simple phenomena of magnetism Exam Style Questions Paper 2
▶️ Answer/Explanation
The rod is attracted no matter which pole of the magnet faces it, so it cannot itself be a permanent magnet (a magnet would be repelled by one pole).
This rules out A, and it must instead be a magnetic material such as iron, which is always attracted to either pole.
Aluminium and copper are not magnetic materials, so they would not be attracted at all.
✅ Answer: (D)
This rules out A, and it must instead be a magnetic material such as iron, which is always attracted to either pole.
Aluminium and copper are not magnetic materials, so they would not be attracted at all.
✅ Answer: (D)
▶️ Answer/Explanation
An electromagnet’s magnetic field is created by an electric current flowing through a coil of wire, so its magnetism can be turned on or off very rapidly simply by switching the current on or off.
A permanent magnet keeps its magnetism at all times and cannot be switched off, so it cannot be used in this way.
This makes an electromagnet the only type of magnet suitable for switching on and off many times per second.
✅ Answer: (A)
A permanent magnet keeps its magnetism at all times and cannot be switched off, so it cannot be used in this way.
This makes an electromagnet the only type of magnet suitable for switching on and off many times per second.
✅ Answer: (A)
▶️ Answer/Explanation
When an unmagnetised iron bar is brought near a magnet, it becomes magnetised by induction, with the nearer end always taking the opposite polarity to the pole facing it.
Since the magnet’s South pole faces end Y, end Y is induced to become a North pole, so that it is attracted to the magnet.
The opposite end, X, is then induced to become a South pole.
✅ Answer: (C)
Since the magnet’s South pole faces end Y, end Y is induced to become a North pole, so that it is attracted to the magnet.
The opposite end, X, is then induced to become a South pole.
✅ Answer: (C)
Question
A bar of soft iron and a bar of steel are held in contact with a strong magnet.
Both bars become magnetised.
The two bars are now moved away from the magnet.
Which statement about the bars is correct?
(A) Both bars lose their magnetism.
(B) Neither of the bars loses its magnetism.
(C) The soft iron bar loses its magnetism but the steel bar retains its magnetism.
(D) The steel bar loses its magnetism but the soft iron bar retains its magnetism.
▶️Answer/Explanation
Ans : C
Question
The diagram shows two soft-iron rods JK and LM placed between the poles of two magnets.
Which row shows the poles induced in the soft-iron rods?
▶️Answer/Explanation
Ans: D