Practice question
Question
A Wheatstone bridge with R_1 = 4 Ω, R_2 = 8 Ω, R_3 = 6 Ω, R_4 = 12 Ω has a 12 V battery across AC and a galvanometer ( 2 Ω ) across BD. What is the current through the galvanometer?
Explanation
Given:
A Wheatstone bridge with R_1 = 4 Ω, R_2 = 8 Ω, R_3 = 6 Ω, R_4 = 12 Ω has a 12 V battery across AC and a galvanometer ( 2 Ω ) across BD. What is the current through the galvanometer?
Formula:
Check balance: R_1/R_2 = 4/8 = 0.5, R_3/R_4 = 6/12 = 0.5.
Substitution & Calculation:
Bridge is balanced. Since balanced, I_g = 0 A .
Final Result:
The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.
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