Practice — Magnetic Effects of Current and Magnetism

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CBSE 12 Physics
U3
Item 5

Multiple choice·Routine exam skill (2/5)·No calculator

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

The SI ampere can be defined using the force between two long parallel conductors. For currents of

1\text{ A}

in each conductor separated by

1\text{ m}

in vacuum, the force per metre is

Choose an answer

2\times10^{-7}\text{ N m}^{-1}

1\text{ N m}^{-1}

2\times10^{-5}\text{ N m}^{-1}

4\pi\times10^{-7}\text{ N m}^{-1}

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