Question

Figure shows a balanced Wheatstone net. Now, it is disturbed by changing P to 11 $\omega$. Which of the following steps will not bring the bridge to balance again?

• A. Increasing R by $2\omega$
• B. Increasing S by $20\omega$
• C. Increasing Q by $10\omega$
• D. Making product $RQ=2200$( ${\omega }^2$)

Answer 1

The correct option is B Increasing S by $20\omega$

Condition for a balanced Wheatstone bridge is $RQ=PS=2200{\Omega }^2$

Hence option D will balance the bridge again. Options A and C do the job of option D. Hence, correct answer is option B.