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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
A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table?
What is a natural magnet? State two limitations of a natural magnet.
In following figure, draw at least two magnetic field lines between the two magnets.
(b) 
Draw the pattern of magnetic field lines near a bar magnet placed with its North Pole pointing towards the geographic North. Indicate the position of neutral points by marking X.
Draw magnetic field lines produced around a current-carrying straight conductor passing through cardboard. Name, state and apply the rule to mark the direction of these field lines.
How do you account for the following fact?
Soft iron keepers help to prevent the magnets from losing their magnetic properties.
State whether true or false. If false, correct the statement.
Magnetic field lines always repel each other and do not intersect.
The magnetic field lines always begin from ____________.
Magnetic lines of force never ______ each other.
State the inference drawn about the direction of the magnetic field lines on the basis of the following diagrams.
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| Figure 'a' | Figure 'b' |
