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# In a practical wheat stone bridge circuit as shown, when one more resistance of 100 W is connected is parallel with unknown resistance ' x ', then ratio _{1} become ' 2 '. l1 is balance length. AB is a uniform wire. Then value of ' x ' must be:

- 50 W
- 100 W
- 200 W
- 400 W

## The correct answer is: 100 W

### wheat stone bridge is in balanced condition

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