7. Which of the following materials increases the strength of an electromagnet? A 2 m wire B. 5 m wire C 1 m wire D. 3 m wire 8. Which of the following is considered in designing your own experiment to determine the factors that affect the strength of an electromagnet? A. Type of wire B. Number of coils C. Number of batteries D. All of the above 9. Electromagnet can be made A. brighter B. better C. stronger D. bolder 10. Which of the following is NOT part of an electromagnet? A. wire B.core C. battery D. needles 11. A magnet that works only when there is a flow of electricity. A. Electromagnet B. Bar Magnet C. Horse Shoe Magnet D. Magnetite 12. Which appliance does NOT use electromagnet? A telephone B. television C. radio D. broom 13. Which is NOT made of electromagnet? A. cooking pan B. transformer C. generator D. motor 14. Which of these forces can be used in a motor? A. magnetism B. wind C. friction D. gravity 15. Which of the electromagnets would have the greatest magnetic field?
