Advertisements
Advertisements
प्रश्न
There are two knitting needles. One of them is magnetized. How will you find out which one is magnetized, if no other magnet is available?
Advertisements
उत्तर
When an iron bar is magnetized, it slightly increases in length due to the setting of molecular magnets along straight chains. So, on precisely measuring the length of the knitting needle, the knitting needle which is slightly longer in length than the other is magnetized.
APPEARS IN
संबंधित प्रश्न
“Poles exist in pair”. Comment on this statement ?
Write true or false of the following statement.
Magnetic keeper is a wooden piece.
What is the magnetic induction? Explain with the help of a diagram.
Give a reason for the following.
Iron is a magnetic substance.
Define the following term regarding a bar magnet:
Magnetic field
How will you do this?
Explain that a magnet has a certain magnetic field.
Describe, how you will proceed to determine the position of the pole of a bar magnet.
If a magnet is carefully broken into two pieces as shown in figure (i), how does the magnetic strength of each piece compare with that of the original magnet? If another magnet is carefully broken in half along its long axis shown in figure (ii), how would the strength of each piece compare with that of the original magnet?
Explain the mechanism by which unmagnetized iron nails get attracted to a magnet when brought near it.
Magnets are used in _______ for generating electricity.
