First Principles of Natural Philosophy a Text book for Common Schools

Cover First Principles of Natural Philosophy a Text book for Common Schools
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\ Precedes Attr*cti# POLBS.
Compass. Dipping. DECLINATION. DIP.
MAGNETIC NEEDLES.
L RELATION TO ENERGI NATURAL PHILOSOPffT. 302 EXERCISES.
t State the first law of magnets and tell why you believe it ia be true.
2. When you break a bar magnet have you two parts of a magnet?
8. What is meant by retentivity ? What other name has the same thing ?
4. Give good reasons for believing that the earth is a magnet 5. Mention three magnetic substances.
6. How can you obtain a magnet with a single pole ?
7
.... A dozen steel sewing-needles are hung in a bunch by threads passed through their eyes. How will they behave when hung over the pole of a strong magnet ?
8. Devise an experiment to show how to cut off the influence of a magnet from a piece of iron that is not far distant.
9. If one should carry a dipping needle from the north magnetv- 1 pole of the earth to the south magnetic pole, how would the needle change its position during the journey ?
10. How can I magnetize an iron bar without using a current of electricity or a steel or iron magnet ?


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