# Shown in the figure below is a meter­bridge set up with null deflection in the galvanometer. The value of the unknown resistance  R is : Option 1) Option 2) Option 3) Option 4)

As we learnt in

Wheat stone Bridge -

It is an arrangement of four resistances which can be used to measure one of them in terms of rest

- wherein

This is a Wheatstone bridge.

If      is the resistance per unit length (in cm)

Option 1)

This option is incorrect.

Option 2)

This option is incorrect.

Option 3)

This option is correct.

Option 4)

This option is incorrect.

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