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Short answer·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 Wheatstone bridge, the arms are AB=10 ΩAB=10\ \Omega, BC=15 ΩBC=15\ \Omega, AD=20 ΩAD=20\ \Omega, and DC=30 ΩDC=30\ \Omega. A galvanometer connects BB and DD.
Total: 3 marks

(a) Check whether the bridge is balanced. (2 marks)

(b) State the current through the galvanometer. (1 mark)

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cbse-physics-12.u2.t2-5.saq.002

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