A student measures the strength of the magnetic field at several distances from the wire in Figure 7.
Figure 8 shows most of the student’s results.
Figure 8
Figure 9 shows two extra sets of results.
mT is a unit of strength of a magnetic field.
distance from wire in cm |
strength of magnetic field in mT |
1.0 |
8.1 |
2.0 |
3.9 |
Figure 9
i)
Plot the two extra points on Figure 8.
[2]
ii)
Draw a best fit curve on the graph in Figure 8.
[1]
iii)
Use the graph in Figure 8 to calculate the change in strength of magnetic field when the distance from the wire changes from 4cm to 8 cm.
[2]
change in strength of magnetic field = ................................ mT
iv)
The distance from the wire affects the strength of the magnetic field.
State one other factor that affects the strength of the magnetic field.
[1]