4 Answer in one sentence 1. Give any two uses of metal detectors. 2. Give any two characteristics of magnets. 3. Define magnetic field . 4. Who introduced the concept of lines of force? 5. What is meant by scattering of light? 6. What is an eclipse? 7. Define point source. 8. Define extended source. 9. Define penumbra. 10. List the properties of magnetic lines of force given by Michael Faraday. 11. What is an electromagnet? 12. Can two magnetic lines of force intersect each other? 13. What does the number of magnetic lines of force at a particular point determine? 14. Which eclipse occurs on a full moon day? 15. Give 2 examples of point source. 16. Give 2 examples of extended source.
Answers
Answer:
1. Uses include detecting land mines, the detection of weapons such as knives and guns (especially in airport security), geophysical prospecting, archaeology and treasure hunting.
2. Two properties of a magnet are: (i) A magnet always has two poles: a north pole and south pole. (ii) Like magnetic poles repel each other and unlike magnetic poles attract each other.
3. a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
4. The concept of lines of force was introduced into physics in the 1830s by the English scientist Michael Faraday, who considered magnetic and electric effects in the region around a magnet or electric charge as a property of the region rather than an effect taking place at a distance from a cause.
Explanation:
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