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प्रश्न
Explain the mechanism of attraction of iron nails by a magnet when brought near them.
उत्तर
When iron nails are brought near one end of a magnet, the nearer end of piece acquires an opposite polarity by magnetic induction. Since unlike poles attract each other, therefore, iron nails are attracted towards the end of the magnet. Thus, the iron nail first becomes a magnet by induction and then it is attracted.
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संबंधित प्रश्न
Fill in the following blank with suitable words:
Magnetic field lines leave the .......... pole of a bar magnet and enter at its .......... pole.
The shape of the earth's magnetic field resembles that of an imaginary:
(a) U-shaped magnet
(b) Straight conductor carrying current
(c) Current-carrying circular coil
(d) Bar magnet
In the straight wire A, current is flowing in the vertically downwards direction whereas in wire B the current is flowing in the vertically upward direction. What is the direction of magnetic field:
(a) in wire A?
(b) in wire B?
Name the rule which you have used to get the answer.
What is a lodestone?
Explain the following :
The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.
What conclusion is drawn regarding the magnetic field at a point if a compass needle at that point rests in any direction? Give reason for your answer.
State whether true or false. If false, correct the statement.
Magnetic field lines always repel each other and do not intersect.
A closely wounded circular coil of radius 5 cm produces a magnetic field of 37.68 × 10-4 T at its center. The current through the coil is ______ A. [Given, number of turns in the coil is 100 and π = 3.14)
Assertion (A): Magnetic field lines never intersect each other.
Reason (R): If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.
