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Two resistances of 4 Omega are connected...

Two resistances of `4 Omega` are connected in the 2 gaps of a metre bridge. Balancing length is noted. Another equal resistance is connected in parallel with `4 Omega` in the left gap. Change in balancing length is approximately

A

0.5 m

B

0.4 m

C

0.3 m

D

0.17 m

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