To determine the strength of the electromagnets' magnetic forces, we consider both the current intensity and the number of turns in each electromagnet. Generally, a higher current intensity and a greater number of turns result in a stronger magnetic field.
Let's evaluate each electromagnet:
- Electromagnet P: Current intensity = medium (20 turns)
- Electromagnet Q: Current intensity = low (20 turns)
- Electromagnet R: Current intensity = low (15 turns)
Since we don't have specific values for what "medium" and "low" current intensities are, we interpret "medium" current as being stronger than "low."
- Electromagnet P has a medium current (which we will consider stronger than a low current) and 20 turns.
- Electromagnet Q has a low current and 20 turns.
- Electromagnet R has a low current and only 15 turns.
Based on these parameters, we can rank the electromagnets:
- P: Strongest (medium current)
- Q: Second strongest (low current, 20 turns)
- R: Weakest (low current, 15 turns)
Thus the order from strongest to weakest magnetic force is: P, Q, R.
The correct response is:
P, Q, R.