To determine the order of the devices from greatest to weakest magnetic field strength, we can follow these steps:
1. Calculate the magnetic field strength for each device. The magnetic field strength can be determined by multiplying the number of wire loops by the current. It is noteworthy that, in this question, the current should be converted from milliamps (mA) to amps (A) by dividing by 1000. However, since we are only comparing the relative strengths, we can use the given current values (mA) directly.
2. Device W:
- Wire Loops: 60
- Current: 0.0 mA
- Magnetic Field Strength = [tex]\( 60 \times 0.0 = 0.0 \)[/tex]
3. Device X:
- Wire Loops: 40
- Current: 0.2 mA
- Magnetic Field Strength = [tex]\( 40 \times 0.2 = 8.0 \)[/tex]
4. Device Y:
- Wire Loops: 30
- Current: 0.1 mA
- Magnetic Field Strength = [tex]\( 30 \times 0.1 = 3.0 \)[/tex]
5. Device Z:
- Wire Loops: 20
- Current: 0.1 mA
- Magnetic Field Strength = [tex]\( 20 \times 0.1 = 2.0 \)[/tex]
6. Compare the magnetic field strengths:
- Device X: 8.0
- Device Y: 3.0
- Device Z: 2.0
- Device W: 0.0
From greatest to weakest magnetic field strength, the order is:
1. X (8.0)
2. Y (3.0)
3. Z (2.0)
4. W (0.0)
Therefore, the list of devices from greatest to weakest magnetic field strength is:
X, Y, Z, W
The correct answer is:
[tex]$X, Y, Z, W$[/tex]
