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Current Electricity question

2022 · Q151
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Current Electricity question

2022 · Q151

NEETPhysicsCurrent ElectricityMCQ+4 / −1

A cell of emf 4 V and internal resistance 0.5 Ω\OmegaΩ is connected to a 7.5 Ω\OmegaΩ external resistance. The terminal potential difference of the cell is

  1. A
    0.375 V
  2. B
    3.75 V
  3. C
    4.25 V
  4. D
    4 V
View written solutionFree

Correct answer: B

NEET 2022 Phase 2 Physics - Current Electricity Question 22 English Explanation

From Kirchhoff's loop law :

$V - Ir - IR = 0$

$$ \Rightarrow I = \left( {{V \over {r + R}}} \right)$$

Terminal potential difference across cell,

${V_{AB}} = IR$

$${V_{AB}} = {{RV} \over {r + R}}$$

$$ = {{7.5 \times 4} \over {0.5 + 7.5}} = 3.75\,V$$

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