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Multiple choice·Routine exam skill (2/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

An Amperian loop encloses three long wires carrying currents 4 A4\text{ A} out of the page, 2 A2\text{ A} into the page, and 5 A5\text{ A} out of the page. Taking out of the page as positive, ∮B⃗⋅dl⃗\oint \vec B\cdot d\vec l equals
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cbse-physics-12.u3.t3-1.mc.003

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