Question

Which list shows the electromagnets in order from strongest magnetic force to weakest magnetic force?

electromagnet current intensity number of turn turns
p medium 20
q low 20
r low 15


which list shows the electromagnets in order from strongest magnetic force to weakest magnetic force?


A. R, Q, P
B. Q, R, P
C. P, Q, R
D. R, P, Q

Answer 1

To determine the strength of the electromagnets, we need to consider both the current intensity and the number of turns in the coil. The magnetic force of an electromagnet can be generally influenced by the following factors:

1. **Current Intensity**: Higher current results in a stronger magnetic field.
2. **Number of Turns**: More turns of wire around the core also contribute to a stronger magnetic field.

Now let's analyze each electromagnet:

- **Electromagnet P**: Medium current intensity, 20 turns.
- **Electromagnet Q**: Low current intensity, 20 turns.
- **Electromagnet R**: Low current intensity, 15 turns.

Now we can infer:

1. **Electromagnet P** has a medium current and the highest number of turns (20), which gives it a strong magnetic force.
2. **Electromagnet Q** has a low current but the same number of turns as P (20). Therefore, it will be weaker than P.
3. **Electromagnet R** has a low current and fewer turns (15), making it weaker than both P and Q.

Considering this analysis, the order from strongest to weakest is:

1. **P** (strongest)
2. **Q**
3. **R** (weakest)

Thus, the answer is **C. P, Q, R**.