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A battery is connected to a potentiomete...

A battery is connected to a potentiometer and a balance point is obtained at `84 cm` along the wire. When its terminals are connected by a `5 Omega` resistor, the balance point changes to `70 cm`.
Find the new position of the balance point when `5 Omega` resistor is changed by `4 Omega` resistor.

A

By adding a resistance `9980 Omega` in parallel with the galvanometer

B

By adding a resistance `9980 Omega` in series with the galvanometer

C

By adding a resistance `8890 Omega` in parallel with the galvanometer

D

By adding a resistance `9980 Omega` in series with the galvanometer

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