Question

11. By using Krichhoff's rule to deterimine the potential difference between the paint A and D when no current flows in the arm BE of the electric circuit shown in the given diagram. दिये गये विद्युत परिपथ में यदि भुजा BE में धारा प्रमाहित न हो रही हो तब किरचॉफ नियम का उपयोग कर बिन्दु A व B के मध्य विभव अन्तर ज्ञात कीजिये। ​

Answer 1

Solution
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Step 1: Current in the circuit [Refer Fig.]
There is no current in BE branch, so the potential difference across resistance R
1
​
will be zero.

Step 2: Potential difference (V
A
​
−V
D
​
)
To find Potential difference between Points A and D, we can see a path ABED, such that, the branches AB and ED have batteries only and there is no current in branch EB.
Therefore, we can directly find the required potential difference without finding the current in all the branches.

So, In path ABED
V
A
​
−6−3−0=V
D
​



V
A
​
−V
D
​
=9 V
​


Note: There is no need to apply KVL to find current in all the branches.
solution