Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • In the circuit shown in figure each cell has emf 5V and has an internal resistance of 0.2 ohm. What is the reading of ideal voltmeter V.   <img alt="" src="https://cdn.entra

In the circuit shown in figure each cell has emf 5V and has an internal resistance of 0.2 ohm.
What is the reading of ideal voltmeter V.  

Option: 1

0V


Option: 2

1V


Option: 3

2V


Option: 4

5V


Answers (1)

best_answer

As internal resistance of an ideal voltmeter is infinite, the resistance of the battery across which it is connected will not change by its presence as
\frac{1}{r_1}=\frac{1}{r}+\frac{1}{\infty} \quad \Rightarrow \quad r^{\prime}=r
Now as the given 8 batteries are discharging in series i.e
E_{e q}=8 \times 5=40 \mathrm{~V} \text { and } r_{e q}=8 \times 0.2=1.6 \Omega
so current in the circuit 
 \begin{aligned} I & =\frac{E_{\text {eq }}}{r_{\text {eq }}}=\frac{40}{1.6} \\ & =25 \mathrm{~A} \end{aligned}
Hence potential difference across the required battery
\mathrm{v}=\mathrm{E}-\mathrm{Ir}=5-25 \times 0.2=0 \mathrm{~V}

Posted by

Suraj Bhandari

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

Amrita BTech Admission 2025: JEE Main-based registration deadline extended to August 30
anam-khan

DASA, CSAB Special round 2 seat allotment result 2025 declared on csab.nic.in

Latest Question