Q 2652591434.     In a practical wheat stone bridge circuit as shown, when one more resistance of `100 Omega` is connected is parallel with unknown resistance' x ', then ratio `l_1// l_2` become' 2' `l_1` is balance length. AB is a uniform wire. Then value of' x' must be:

A

`50 Omega`

B

`100 Omega`

C

`200 Omega`

D

`400 Omega`

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