Q 1. Explain why Earth is called as a gigantic magnet?
Q2. Write the properties of Magnetic lines of force?
Q3. Short note: Magnetic detector
Answers
Answer:
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Explanation:
Ans. 1 Scientists think that Earth's magnetic field is generated here. It is caused by the motion of this liquid metal. The liquid metal moves as Earth spins on its axis. Charged particles flow through Earth's liquid outer core, making Earth a giant magnet.
Ans. 2 The magnetic lines of force has the following properties:
• Each line is a closed and continuous curve.
• They originate from the north pole and terminate at the south pole.
• They will never intersect each other.
• They are crowded near the poles where the magnetic field is strong.
Ans. 3 A metal detector is an instrument that detects the presence of metal nearby. ... If another coil is used to measure the magnetic field (acting as a magnetometer), the change in the magnetic field due to the metallic object can be detected.