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If the galvanometer in a Wheatstone bridge has a resistance of 5Ω and the bridge

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Question: If the galvanometer in a Wheatstone bridge has a resistance of 5Ω and the bridge is balanced, what is the current through the galvanometer?

Options:

  1. Zero.
  2. 5A.
  3. 1A.
  4. 10A.

Correct Answer: Zero.

Solution: 

In a balanced Wheatstone bridge, the current through the galvanometer is zero.

If the galvanometer in a Wheatstone bridge has a resistance of 5Ω and the bridge

Practice Questions

Q1
If the galvanometer in a Wheatstone bridge has a resistance of 5Ω and the bridge is balanced, what is the current through the galvanometer?
  1. Zero.
  2. 5A.
  3. 1A.
  4. 10A.

Questions & Step-by-Step Solutions

If the galvanometer in a Wheatstone bridge has a resistance of 5Ω and the bridge is balanced, what is the current through the galvanometer?
  • Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances.
  • Step 2: Know that a galvanometer is an instrument used to detect and measure small electric currents.
  • Step 3: Recognize that a balanced Wheatstone bridge means that the ratio of the resistances in one branch is equal to the ratio in the other branch.
  • Step 4: In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero.
  • Step 5: Since the potential difference is zero, there is no current flowing through the galvanometer.
  • Step 6: Therefore, the current through the galvanometer is zero.
  • Wheatstone Bridge – A circuit used to measure unknown resistances by balancing two legs of a bridge circuit.
  • Balanced Condition – In a balanced Wheatstone bridge, the ratio of resistances in one leg is equal to the ratio in the other leg, resulting in no current through the galvanometer.
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