COMEDK · Physics · 19. Current Electricity
For a cell, \(V\) - \(I\) graph is given below.
Which of the following options gives correct value of emf of cell and its internal resistance?
- A \(1.5 \mathrm{~V}, 1.0 \Omega\)
- B \(1.5 \mathrm{~V}, 2.0 \Omega\)
- C \(1.0 \mathrm{~V}, 1.5 \Omega\)
- D \(1.5 \mathrm{~V}, 1.5 \Omega\)
Answer & Solution
Correct Answer
(D) \(1.5 \mathrm{~V}, 1.5 \Omega\)
Step-by-step Solution
Detailed explanation
From graph, \(V=1.5 \mathrm{~V}\) at \(I=0\) \(\therefore \mathrm{EMF}\) of cell \(=1.5 \mathrm{~V}\) At \(V=0, I=1000 \mathrm{~mA}=1 \mathrm{~A}\) Now using, \(E-V=I r\) We have, \(1.5-0=1 \times r\) \(\Rightarrow \quad r=1.5 \Omega\)
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