To determine the strength of the magnetic force of the electromagnets, we consider both the current intensity and the number of turns. The strength of the magnetic field (B) created by an electromagnet can generally be estimated using the formula:
\[ B \propto (\text{Current Intensity}) \times (\text{Number of Turns}) \]
- Electromagnet P: Current Intensity = medium, Number of Turns = 20.
- Electromagnet Q: Current Intensity = low, Number of Turns = 20.
- Electromagnet R: Current Intensity = low, Number of Turns = 15.
In this case, without exact values for "medium" and "low" current intensities, we can assume:
- "medium" is higher than "low".
- The number of turns contributes positively to the strength.
Now, let's analyze the strength qualitatively:
- Electromagnet P has medium current and 20 turns.
- Electromagnet Q has low current and 20 turns.
- Electromagnet R has low current and 15 turns.
Given that:
- Electromagnet P (medium x 20) will be stronger than both Q (low x 20) and R (low x 15).
- Between Q and R, Q has the same number of turns (20), but a higher current intensity than R (which has only 15 turns).
Thus the order from strongest to weakest magnetic force is:
P > Q > R
So the correct response is:
P, Q, R
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