A group of students plans several investigations to test the factors affecting an electromagnetic field. First, they vary the number of times an insulated wire is wrapped around a steel nail. The ends of the wire are attached to each end of a 1.5 V battery to complete a simple circuit, as shown in the image.
The students record the maximum number of paper clips the magnet will lift for each trial.
Number of Coils Number of Paper Clips
10 3
20 7
30 9
40 12
Next, the students add a second battery and repeat the investigation.
They record the maximum number of paper clips the magnet will lift for each trial.
Number of Coils Number of Paper Clips
10 5
20 8
30 11
40 16
Then, they wrap insulated wire 25 times around different types of nails. The ends of the wire are attached to a single battery. The students record the properties of each type of nail and the maximum number of paper clips the magnet will lift for each trial.
Metal
Electrical Conductivity
Magnetic
(Yes/No)
Number of Paper Clips
Aluminum High conductivity No 0
Iron Medium conductivity Yes 15
Steel Low conductivity Yes 10
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Multiple Choice Question
Which BEST describes the role of the nail in the electromagnetic field?
A.
The metallic properties act as a magnet
B.
The magnetic properties act as a magnet
C.
To conduct thermal energy through the magnetic field
D.
To conduct electrical current through the magnetic field
1 answer
The best description of the role of the nail in the electromagnetic field is:
B. The magnetic properties act as a magnet.
This is because the nail, particularly when made of ferromagnetic materials like iron or steel, enhances the strength of the magnetic field created by the current flowing through the wire coils. The magnetic properties of the nail allow it to become magnetized and increase the overall magnetic effect of the electromagnet.
1 answer
3 answers
1 answer
1 answer