Exam-style question
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In a required practical, a wire is placed in a magnetic field and experiences a force of 4 N when a current of 2 A flows through it. If the length of the wire in the magnetic field is 1.5 m, calculate the magnetic flux density. Scenario focus: magnetic fields 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 magnetic flux density is 1.33 T.
Explanation
Why this works
The correct answer is The magnetic flux density is 1.33 T.. This is correct for Magnetic fields because the stem is testing magnetic fields; 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.