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A All electromagnets are permanent magnets
Increasing the number of coils in an electromagnet
decreases it strength
c. Increasing the batteries increases its strength
Both A and B
2 Which can increase the strength of an electromagnet?
A increasing the number of coils around the nail
B. increasing the number of batteries
c making the core bigger
D. all of the above
3. Which of the electromagnets would have the greatest
magnetic field?
D
Photo Credit: Hermore 2
4. Which of the following is NOT part of an electromagnet?
A wire B. core C battery D. needles
5. A magnet that works only when there is a flow of electricity
A Electromagnet
B. Bar Magnet
C. Horse Shoe Magnet D. Magnetite
6. Which appliance does NOT use electromagnet?
A telephone B. television Cradio D. broom
7. Which is NOT made of electromagnet?
A cooking pan B. transformer C generator D. motor
8. Which of these forces can be used in a motor?
C friction
D gravity
9. Electromagnets are
A magnetism B. wind
A permanent B. instant C temporary D. stable
10. Which makes an electromagnet work?
A needle B. electricity c pin D. thumbtacks
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