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
Select the correct alternative
A freely suspended magnet rests in
You are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them ?
What is declination ? Draw a diagram to show the angle between the declination and true direction of geographic north.
Define the following term regarding a bar magnet:
Magnetic field
Fill in the blank.
The perpendicular bisector of the line joining the two poles of a magnet is called ...................
Since every iron atom is a tiny magnet, why are not all iron bar magnets?
Draw the magnetic field lines around a bar magnet when a bar magnet is placed such that the N pole points North.
Artificial magnets are made in different shapes such as ______, _____ and _______.
Match the following.
| Magnetite | Magnetic lines |
| A tiny pivoted magnet | Natural magnet |
| Cobalt | Compass box |
| Closed curves | Ferromagnetic material |
| Bismuth | Diamagnetic material |
