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WorksheetsElectromagnet and Its Strength
Total questions: 20
Worksheet time: 16mins
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
Which setup will create the weakest electromagnet?
100 turns, iron core, 2A current
100 turns, plastic core, 2A current
50 turns, iron core, 1A current
100 turns, steel core, 2A current
Which factor is not essential to form an electromagnet?
Magnetic core
Coil of wire
Battery or current
Permanent magnet
What will happen if the coil is not connected to a power source?
The electromagnet will be stronger
The magnet will work using gravity
No magnetic field will be created
The wire becomes a permanent magnet
Why does increasing current increase the strength of an electromagnet?
It increases resistance
It cools down the core
It generates a stronger magnetic field
It removes magnetic properties
If two electromagnets are built with the same current and number of turns, but one has an iron core and the other has no core, what is the expected result?
The one without a core is stronger
Both are equally strong
The one with an iron core is stronger
The one without a core produces light
Which change would result in no change in the strength of the electromagnet?
Changing core from iron to plastic
Doubling the number of coil turns
Reversing battery connections
Increasing the current
How does a soft iron core help in electromagnets?
It reflects electricity
It allows faster current
It strengthens the magnetic field
It generates heat
What happens if you wrap the coil in the opposite direction?
No magnetic field is produced
The poles are reversed
The magnet becomes weaker
It catches fire
A student increases the number of turns but reduces the current. What is the best prediction?
Magnet becomes weaker
It stays the same
Changes are unpredictable
Depends on the core
List down the three factors that affect the strength of an electromagnet.
1. (a)
2. (b)
3. (c)
