the correct answer
1. Which of the following object can be picked up by a magnet?
A. a gold ring
B. a handkerchief
C.a rubber eraser
D. plastic ballpen
2. One end of a magnet was placed near the end of another. They repelled each other. The
poles were probably
A north and south
B. north and north
Ciron nail
D. very weak
3. They are used to transmit signals as the telegraph, telephone, radio and television
A electromagnet
B. dry cell
Cwet cell
D.Jelectrical wire
4. I want to make my electromagnet stronger. I can increase one of the following:
A. The distance between loops
B. The amount of electrical current
C. The number of objects to be picked up
D. The distance between the magnet and the objects to be picked up
5. Which of the following is used to make an electromagnet?
A, a coil
B. a nail
C. a piece of rubber
D. wood
6. You conclude that a particular end of magnet is its pole because with it iron can pick-up.
Al clip
B. 5 clips
C. 20 clips
D. no clips
7. What material is used to show the magnetic line of force?
A. iron filings
B. marbles
C. pebbles
D. salt​