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1. what is the scientific problem in the experiment ?
A. what is the effect of the size of the nail to the strength of the electromagnet ?
B. what is the effect of the number of the dry cells to the strength of the electromagnet?
C. what is the effect of the number of coils to the strength of the electromagnet ?
D. what is the effect of the number of paper clips attracted to the strength of the electromagnet ?
2. What are the controlled variables in the experiment?
1. number of coils
II. number of dry cell
III. number of paper clips
IV. size of nail
A. I and II
B. II and III
C. II and IV
D. I and III
3. What is the independent variable in the experiment?
A. number of coils
B. number of dry cells
C. number of paper clips
D. size of nail
4. What is the dependent variable in the experiment?
A. number of coils
B. number of dry cells
C. number of paper clips
D. size of nail
5. Which of the following is the BEST conclusion for the experiment?
A. Increasing the number of coils increases the strength of an electromagnet.
B. Decreasing the number of coils increases the strength of an electromagnet.
C. Increasing the number of dry cells increases the strength of an electromagnet.
D. Decreasing the number of dry cells increases the strength of an electromagnet what is the effect of the number of the dry cells to the strength of the electromagnet
