Question

when is a wheatstone's bridge most sensitive?

Answer 1

The wheatstone bridge is said to be most sensitive, If the galvanometer shows a large deflection for a small resistance change in the resistance arm.

• The sensitivity of a wheatstone bridge is defined as the galvanometer's deflection to unit fractional change in uncertain resistance value.
• The wheatstone bridge's sensitivity depends on two factors: the relative resistance magnitudes in the bridge's four arms. When all four resistors are of the same order, the bridge is most sensitive. Relative battery and galvanometer positions.
• For greater sensitivity of the Wheatstone bridge, the one with higher resistance from the battery and the galvanometer should be connected between the junction between the two highest resistors and the junction between the two lowest resistors.

Answer 2

The wheatstone's bridge most sensitive when the galvanometer which present in the bridge show zero deflection.

Explanation:

• Wheatstone Bridge is the most sensitive when the bridge is balanced the resistances which are present in the wheatstone bridge, i.e all the four resistances are equal in quantity, that is the ratio of the resistances are 1:1.
• Then, the Galvanometer that is present in between the bridges will show zero deflection.
• This is when the wheatstone bridge is most sensitive such that even a small change or deflection in the quantity of resistance will be noted by the change in deflection of galvanometer.

To know more:

Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude.

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