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Multiple choice·Standard multi-step (3/5)·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

In a meter bridge experiment, the unknown resistance XX is in the left gap and R=6 ΩR=6\,\Omega is in the right gap. The balance point is 40 cm40\,\text{cm} from the left end. The value of XX is
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cbse-physics-12.lab.tlab-1.mc.002

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