If the switch is closed then the current will flow:
Correct answer: A. From A to B
- A. From A to B
- B. From B to A
- C. 0
- D. Cannot say unless the resistance of the galvanometer is given
Explanation
Given:Left branch:Top: R1=10 ΩBottom: R2=5 ΩRight branch:Top: R3=5 ΩBottom: R4=10 ΩStep 1: Check the balance condition of the Wheatstone BridgeR1/R2 = 10/5= 2,R3/R4= 5/10 = 0.5⇒2 ≠ 0.5The bridge is not balanced, so current will flow through the galvanometer.Step 2: Use the potential divider ruleAssume total battery voltage = VVVLeft side current:I = 10 V/15Right side current:I = 5 V/15Step 3: Compare potentialsVA >VB So, current flows from A to B through the galvanometer.
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