Question

A circuit diagram is given below. Analyze the figure and answer the following questions.

1. The above circuit is a modification of…….. 

2. What is the value of balancing length?

3. If 1.5 V cell is replaced by a 3V cell what will be the balancing length? 

4. Calculate the value of X.

Answer 1

1. Wheatstone bridge.

2. 100 - 20 = 80 cm

3. No change in balancing length

4. \(\frac{P}{Q}\) = \(\frac{R}{S}\) 

ie  \(\frac{x}{5}\) = \(\frac{80}{20}\)

x = \(\frac{80}{20}\times5\) = 20Ω