The instrument(s) which work on the principle of Wheatstone bridge is/are:
Correct answer: E. A, B and C
- A. Meter Bridge
- B. The Post Office Box
- C. Carey Foster's Bridge
- D. Calendar
- E. A, B and C
Explanation
All of the above mentioned instruments work upon the principle of Wheatstone bridge to measure the resistance except calendar.The Wheatstone bridge works on the principle of null deflection, i.e. the ratio of their resistances is equal, and no current flows through the circuit. Under normal conditions, the bridge is in an unbalanced condition where current flows through the galvanometer.All of the given examples work on this principle.
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