Practice — Magnetic Effects of Current and Magnetism

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CBSE 12 Physics
U3
Item 4

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

Two long parallel wires

2.0\text{ cm}

apart carry currents

10\text{ A}

and

5.0\text{ A}

in the same direction. The force per unit length between them is

Choose an answer

5.0\times10^{-4}\text{ N m}^{-1}

5.0\times10^{-6}\text{ N m}^{-1}

5.0\times10^{-3}\text{ N m}^{-1}

2.5\times10^{-4}\text{ N m}^{-1}

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