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प्रश्न
Which substances are used for making electromagnets?
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उत्तर
To make an electromagnet, we require the following:
- A long conducting copper wire
- An iron nail on which the copper wire has to be wound
- A switch
- A battery
संबंधित प्रश्न
Define magnetic field lines. Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole.
Explain why, a freely suspended magnet always points in the north-south direction.
A magnetic field exerts no force on:
an electrical charge moving perpendicular to its direction
an unmagnetised iron bar
a stationary electric charge
a magnet
Can two magnetic field lines intersect each other? Give reason to your answer.
A dry cell can supply a charge of 800 C. If continuous current of 8.0 mA is drawn, calculate the time in which cells will discharge completely.
Select the correct option:
Nickel is a:
State briefly the molecular theory of magnetism.
State whether true or false. If false, correct the statement.
Magnetic field lines always repel each other and do not intersect.
The relation between weber and Tesla is ______.
Magnetic lines of force never ______ each other.
