CUET Preparation Today
Assertion (A) : The earth's magnetic field is due to iron present in its core. Reason(R) : At low temperature, magnet loses its magnetic property or magnetism. |
Both A and R are correct and R is a correct explanation of A Both A and R are correct and R is NOT a correct explanation of A Both A and R is false R is true but A is false |
Both A and R is false |
The correct answer is option 3: Both A and R is false The Earth's magnetic field is primarily caused by the movement of molten iron and nickel in the outer core, which generates electric currents. This process is known as the Geo-dynamo effect. Hence, A is a false Statement. A magnet loses its magnetism at high temperatures, not low temperatures. When a ferromagnetic material is heated beyond its Curie temperature, it loses its permanent magnetism. At low temperatures, a magnet retains or even strengthens its magnetic properties. Hence, the Reason is also false. |
