4. You try to remove the small pins from
rice grains because they accidentally mix.You use a magnet bar to do this. How will you explain magnetism?
A. A contact force.
B. A force created by magnets.
C. An energy created by magnets.
D. An invisible force that attracts electrically charged particles.
5. The more current flowing into an electromagnet the more it becomes stronger. Which of the statement below will increase its strength?
A. By decreasing the size of the core.
B. By increasing the number of pins in the core.
C. By increasing the number of turns in the coil.
D. By decreasing the number of turns in the coil.
6. An electromagnet can move materials made of steel, iron, cobalt, or nickel. Which of these will attract to an electromagnet?
A. Mongol pencil
B. Plastic bottle
C. Thumb tacks
D. Tissue paper
7. Permanent magnets and electromagnets are similar in which TWO ways?
I. They can be turned off and on.
II. They are surrounded by a magnetic field.
III. They both have a North Pole and South Pole.
IV. They both have weak North Pole and South Pole.
A. I and II is the answer.
B. I and IV is the answer.
C. II and III is the answer.
D. III and IV is the answer.
8. The changes in each part of the electromagnet will influence its overall strength. Which component provides the energy or the power source to run the electromagnet?
A. Battery
B. Iron nail
C. Switch
D. Wire
9. Luis made an electromagnet but he found out that it was very weak. How can he make it stronger?
A. He will use less copper wire.
B. He will wrap the wire loosely.
C. He will take away the battery.
D. He will coil more copper wire.
Brainliest If You Are Correct✨
num 10 on the pic ;)
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