Magnetic lines of force
Are closed and continuous curves
Travel in E-W direction
Always intersect each other
Possess all of these properties.
Magnets lose their properties if they are
heated
dropped from a height
hit with a hammer
all the above
Where do magnet has the strongest magnetic force?
At the middle
At the north pole
At the south pole
At the ends
Only one magnetic keeper is required for a
Bar magnet
Two bar magnets
Horse shoe magnet or a U- shaped magnet
All the above
A magnetic keeper is
A person who looks after magnets
A piece of aluminium that is placed at the ends of the two bar magnets.
A piece of steel that is placed at the ends of the two magnets
A piece of soft iron that is placed at the ends of the bar magnets .
Which of the following character is wrong about a magnet?
Magnetic poles always exist in pairs
Like poles attract each others
Magnetic lines of force never intersect
It is impossible to obtain a piece of magnet having only one magnetic pole .
The region around a magnet where its influence can be felt is called its
Magnetic field
Magnetic poles
Magnetic axis
Which of the following property of magnet is utilized by making a magnetic compass?
Attractive property
Repulsive property
Directive property
The strength of an electromagnet depends on
The amount of current passing though coil
The number of turns of the coil
Both a and b
The thickness of the soft iron which is used to make a magnet
If the amount of current passing through the coil is increased ,then the strength of the electromagnet
Increases
Decreases
No change
First increases then decreases
