Electromagnet and Its Strength

The table shows the relationship between the number of coil turns and the number of paper clips picked up by the electromagnet.

Which conclusion is best supported by the table?

• Fewer turns result in stronger electromagnets

• The number of turns does not affect strength

• More coil turns increase the magnetic strength

• Strength remains constant regardless of turns

The graph shows three lines, each representing the effect of different core materials on magnetic strength with increasing current.

Which core material is most effective in strengthening the electromagnet?

• Air

• Iron

• Steel

• All are equal

A graph shows that at 2A, the strength is 4N; at 3A, it's 6N; and at 4A, it's 8N.

What kind of relationship does this graph suggest between current and magnetic strength?

• Inverse – When one goes up, the other goes down

• Constant – Always the same, no change

• Non-linear – Changes, but not in a regular pattern

• Directly proportional – Both go up together at the same rate

Refer to the bar graph showing strength for three electromagnets with the same number of turns and current, but different cores. Which factor is being tested?

• Core material

• Number of turns

• Current

• Type of electromagnet

What is the best explanation for the result?

• Iron is a better conductor

• Copper is magnetic

• Iron is a strong magnetic core

• Steel cannot become magnetic

Based on the table below, which setup has the strongest electromagnet?

• Air

• Plastic

• Iron

• All equal

What is the best explanation for the result?

• Iron is a better conductor

• Copper is magnetic

• Iron is a strong magnetic core

• Steel cannot become magnetic

From the table: What conclusion can be drawn?

• Each turn weakens the magnet

• Strength decreases with more turns

• Strength increases proportionally with turns

• The core type affects strength

Which variable in the table below remains constant?

• Number of turns

• Current

• Core material

• Current and Core Material

What role does the electric current play in an electromagnet?

• It keeps the core cool

• It provides light to the magnet

• It generates the magnetic field

• It protects the coil from damage