Electromagnets
7th grade (Year 8 in England) · 16 questions · Common Core: NGSS.MS-PS2-3, NGSS.HS-PS2-5 · England: KS3 Physics: Electricity and electromagnetism (magnetism), KS4 Combined Science: Magnetism and electromagnetism
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Score/ 16
Question 1
Why is an electromagnet useful in a scrapyard crane?
- A. It picks up all metals including aluminium
- B. It is always on
- C. It never needs electricity
- D. It can be switched off to drop the iron and steel
Question 2
Electromagnets: which statement is NOT true?
- A. Increasing the current makes an electromagnet stronger.
- B. The magnetic field of a coil is like that of a bar magnet.
- C. An electromagnet only works when a current flows.
- D. Electromagnets can pick up aluminium cans.
Question 3
An electromagnet picked up these numbers of paper clips: 5 turns: 3 clips 10 turns: 6 clips 15 turns: 9 clips 20 turns: 12 clips If the pattern continues, how many clips would 30 turns pick up?
Answer
Question 4
Which change makes an electromagnet stronger?
- A. using a plastic core
- B. reducing the current
- C. using fewer turns of wire
- D. adding more turns (coils) of wire
Question 5
Electromagnets: which statement is NOT true?
- A. The magnetic field of a coil is like that of a bar magnet.
- B. An electromagnet stays magnetic forever after it is switched off.
- C. Increasing the current makes an electromagnet stronger.
- D. Electromagnets are used in electric bells, speakers and motors.
Question 6
An electromagnet picked up these numbers of paper clips: 5 turns: 3 clips 10 turns: 6 clips 15 turns: 9 clips 20 turns: 12 clips If the pattern continues, how many clips would 25 turns pick up?
Answer
Question 7
Why is an electromagnet useful in a scrapyard crane?
- A. It picks up all metals including aluminium
- B. It is always on
- C. It never needs electricity
- D. It can be switched off to drop the iron and steel
Question 8
Electromagnets: which statement is NOT true?
- A. The magnetic field of a coil is like that of a bar magnet.
- B. An electromagnet stays magnetic forever after it is switched off.
- C. Increasing the current makes an electromagnet stronger.
- D. An electromagnet only works when a current flows.
Question 9
An electromagnet picked up these numbers of paper clips: 10 turns: 3 clips 20 turns: 6 clips 30 turns: 9 clips 40 turns: 12 clips If the pattern continues, how many clips would 60 turns pick up?
Answer
Question 10
Why is an electromagnet useful in a scrapyard crane?
- A. It can be switched off to drop the iron and steel
- B. It picks up all metals including aluminium
- C. It is always on
- D. It never needs electricity
Question 11
Electromagnets: which statement is NOT true?
- A. The magnetic field of a coil is like that of a bar magnet.
- B. Increasing the current makes an electromagnet stronger.
- C. An electromagnet only works when a current flows.
- D. An electromagnet stays magnetic forever after it is switched off.
Question 12
An electromagnet picked up these numbers of paper clips: 10 turns: 4 clips 20 turns: 8 clips 30 turns: 12 clips 40 turns: 16 clips If the pattern continues, how many clips would 60 turns pick up?
Answer
Question 13
What core material makes an electromagnet strongest?
- A. wood
- B. plastic
- C. iron
- D. copper
Question 14
Electromagnets: which statement is NOT true?
- A. A copper core makes an electromagnet much stronger.
- B. Increasing the current makes an electromagnet stronger.
- C. An electromagnet only works when a current flows.
- D. Electromagnets are used in electric bells, speakers and motors.
Question 15
An electromagnet picked up these numbers of paper clips: 10 turns: 3 clips 20 turns: 6 clips 30 turns: 9 clips 40 turns: 12 clips If the pattern continues, how many clips would 50 turns pick up?
Answer
Question 16
Which change makes an electromagnet stronger?
- A. reducing the current
- B. adding more turns (coils) of wire
- C. using fewer turns of wire
- D. using a plastic core
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