Question
Write the history of magnet in brief.
✓
Answer
→We know that a magnet possesses the property of attracting iron.
→Magnetic phenomena are universal in nature. The earth's magnetism predates human evolution.
→The word magnet is derived from the name of an island in Greece called 'magnesia' where magnetic ore deposits were found, around 600 BC .
→Shepherds on this island complained that their wooden shoes (which had nails) at times stuck to the ground. This property of magnets made it difficult for them to move around.
→The directional property of magnets was also known since ancient times. A thin and long piece of a magnet, when suspended freely, points in the north-south direction.
→The name loadstone (OR lode stone) was given to a naturally occuring ore of iron-magnetite, which means leading stone.
→The very first use of magnet (OR magnetic needles) was done by the Chinese for navigation on ships.
→Caravans crossing the Gobi Desert also employed magnetic needles.
→About four thousand years ago, an emperor Huang-ti got built a chariot by his craftsmen ('engineers' of today) on which they placed a magnetic figure with arms out stretched.
→The figure swiveled around so that the figure of the statuette on it always pointed south. With this chariot, Huang-ti's troops were able to attack the army of enemy from the rear in thick fog, and were able to defeat them.
→Magnetic phenomena are universal in nature. The earth's magnetism predates human evolution.
→The word magnet is derived from the name of an island in Greece called 'magnesia' where magnetic ore deposits were found, around 600 BC .
→Shepherds on this island complained that their wooden shoes (which had nails) at times stuck to the ground. This property of magnets made it difficult for them to move around.
→The directional property of magnets was also known since ancient times. A thin and long piece of a magnet, when suspended freely, points in the north-south direction.
→The name loadstone (OR lode stone) was given to a naturally occuring ore of iron-magnetite, which means leading stone.
→The very first use of magnet (OR magnetic needles) was done by the Chinese for navigation on ships.
→Caravans crossing the Gobi Desert also employed magnetic needles.
→About four thousand years ago, an emperor Huang-ti got built a chariot by his craftsmen ('engineers' of today) on which they placed a magnetic figure with arms out stretched.
→The figure swiveled around so that the figure of the statuette on it always pointed south. With this chariot, Huang-ti's troops were able to attack the army of enemy from the rear in thick fog, and were able to defeat them.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A pendulum having time period equal to two seconds is called a seconds pendulum. Those used in pendulum clocks are of this type. Find, the length of a seconds pendulum at a place where $\text{g}=\pi^2\text{m/s}^2.$
→Why is base band signal not transmitted directly? Give any two reasons.
In which direction would a compass needle align if taken to geographic (i) north pole and (ii) south pole?
Can you add two vectors representing physical quantities having different dimensions? Can you multiply two vectors representing physical quantities having different dimensions?
Two identical coils, radius of each is 8 cm and number of turns is 100 are coaxial and their centers are 12 cm apart. If current of 1 A flows in each coil in the same direction, then calculate the magnetic field at the midpoint on the axial line.
A force F facts on a point charge placed on the axis of an electric dipole. If the distance of a point charge from the dipole is doubled, what will be the force on it? Explain the reason also.
Suppose the tube in the previous problem is kept vertical with $A$ upward but the other conditions remain the same. The separation between the cross$-$sections at $A$ and $B$ is $\frac{15}{16}\text{cm}.$ Repeat parts $(a), (b)$ and $(c)$ of the previous problem. Take $g = 10\ m/s^2.$
→Write Kirchhoff's rules for electric circuit.
Calculate the capacitance of capacitor $C$ if the equivalent capacitance of the connection between $A$ and $B$ is $15 \mu F$.
→Write change in position of atom of an element in periodic table due to emission of $\alpha$ and $\beta$ particles from its nucleus.
→