B. It makes the electromagnet stronger
C. It controls the field of attraction.
D. It controls the flow of electricity.
7. What makes electromagnet stonger than it used to be?
C. III and IV only
D. 1. Il and 111
1. Adding more dry cells
II. Using a core with a bigger diameter
III. Increasing the number of coils
IV. Using iron fillings instead of paper clips
Aland Il only
B. II and Ill only
8. Which of these devices uses electromagnet?
1. Electric bell
11. Electric buzzer
A1 and Il only
B. II and IV
III. Telephone
IV. Electric fan
C.1. Il and 11
9. Which of these is NOT a part of an electromagnet?
D. 1, II, III and IV
A. Coil of wire
B. Nail as the core
C. Dry cell
D. Clips and iron fillings
10. What happens when a battery is detached from an electromagnet?
A. It loses its magnetism.
B. Electricity continues to flow.
C. The electromagnet becomes a more permanent one.
D. It attracts more metals.
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Answer
-7.D
-8.A
-9.C
-10.A