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Magnetism
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1994-07-31
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@If you were using the ends of two bar magnets, which of these combinations would attract each other?
North and south
North and north
South and south
@The diagram shows a reed switch. It is switched on by:
#reedsw
placing a magnet close to the glass tube
connecting it to a battery
connecting it to a parallel plate capacitor
@If you placed the ends of two bar magnets together, which of these combinations would repel each other?
North and north
North and south
South and north
@Placing the north poles of two bar magnets together causes them to push away from each other. The correct name for this 'pushing' is:
Repel
React
Restrict
@Which one of the following substances is magnetic?
Steel
Brass
Aluminium
@Which one of the following is not magnetic?
Mercury
Nickel
Cobalt
@If a magnet was floating on a piece of cork in a bowl of water, which way would it point?
North
East
South-east
@Why are magnets made of steel and not iron?
Because steel keeps its magnetism longer than iron
Because steel is easier to shape and bend
Because steel does not rust as quickly
@Which way do magnetic fields flow?
North to south
North to east
East to west
@If a current passes through a wire it makes a magnetic field. What shape is this field?
Circular
Like a bar magnet
The shape is very complicated
@What is a neutral point?
A place where magnetic fields cancel each other out
The exact centre of a magnet
A place where only a North magnetic field exists
@A small compass is placed near a wire which is connected to a 12V battery (d.c). What happens to the needle of the compass?
It points at right angles to the wire
It is not affected in any way
It swings around constantly