Exam-style question
Try this first
A wire carrying a current of 5 A is placed in a magnetic field of strength 0.3 T. If the wire is 2 m long, what is the force acting on the wire? Use the formula F = BIL. Scenario focus: inverse-square reasoning in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
Model answer
What a good answer should say
- The force acting on the wire is 3 N.
Explanation
Why this works
The correct answer is The force acting on the wire is 3 N.. This is correct for Magnetic fields because the stem is testing inverse-square reasoning; the chosen option keeps the field quantity, source interaction, direction, and unit consistent.
The alternatives are weaker because they mix gravitational, electric, magnetic, orbital, or transformer ideas, or they attach the right number to the wrong physical meaning.
Common mistake
No common mistake is linked to this question yet.