Which instrument is placed at the center of a Wheatstone bridge?

  1. ammeter
  2. galvanometer
  3. resistor
  4. rheostat

Answer (Detailed Solution Below)

Option 2 : galvanometer
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Detailed Solution

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CONCEPT:

  • Wheatstone bridge: It is an arrangement of four resistance which can be used to measure one of them in terms of rest. Here arms AB and BC are called ratio arm and arms AC and BD are called conjugate arms.
  • The bridge is said to be balanced when deflection in the galvanometer is zero i.e. no current flows through the galvanometer or in other words VB = VD.
  • In the balanced condition

EXPLANATION:

  • The galvanometer is placed at the center of the Wheatstone bridge. Therefore option 2 is correct.
  • A Wheatstone bridge is a special arrangement of 4 resistors. It can be used to find an unknown resistance.
  • Also, if the Wheatstone bridge is balanced, there will be no current flowing through the galvanometer.

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