Physics-
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Question

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 l subscript 1 end subscript1 l subscript 2 end subscriptbecome ' 2 '. l1 is balance length. AB is a uniform wire. Then value of ' x ' must be:

  1. 50 W    
  2. 100 W    
  3. 200 W    
  4. 400 W    

The correct answer is: 100 W


    wheat stone bridge is in balanced condition

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