Which one of the following force is not needed for the satisfactory operation of any indicating (or measuring) instrument?  

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  1. Damping force
  2. Deflecting force
  3. Gravitational force
  4. Controlling force

Answer (Detailed Solution Below)

Option 3 : Gravitational force
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Detailed Solution

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Concept:

In measuring instruments, the effect of unknown quantity is converted into a mechanical force which is transmitted to the pointer, which indicates on a scale. This moving system has to satisfy following requirements.

(1) Mechanism for producing deflecting torque

(2) Mechanism for producing controlling torque

(3) Mechanism for producing damping torque

Hence gravitational force is not needed for the satisfactory operation of any indicated instrument.

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