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Multiple choice·Hard exam skill (4/5)·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

A balanced Wheatstone bridge has arms AB=5 ΩAB=5\ \Omega, BC=5 ΩBC=5\ \Omega, AD=10 ΩAD=10\ \Omega, and DC=10 ΩDC=10\ \Omega. The supply is connected between AA and CC, and the galvanometer is connected between BB and DD. If the galvanometer resistance is 4 Ω4\ \Omega, the equivalent resistance between AA and CC is
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cbse-physics-12.u2.t2-5.mc.003

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