Physics Current Electricity DUHS 2022
PMDC Verified Question 72 of 112
Four cells of emf 3 volt are connected in series to form a battery. Net emf of the combination is:
A
12 volt
B
1.33 volt
C
9 volt
D
7 volt
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 12 volt
Concept:

When ideal cells are connected in series (positive to negative terminal), their individual electromotive forces add algebraically.

Formula:

$$ E_{total} = E_1 + E_2 + E_3 + \dots $$

Solution:

  • There are 4 cells, each with an EMF of 3V.


  • Total EMF = \( 3\text{V} + 3\text{V} + 3\text{V} + 3\text{V} = 12 \text{ V} \).


Why other options are incorrect:

  • Opt B: Represents a parallel calculation logic.


  • Opt E: This would be the total EMF if they were connected in perfectly parallel configurations instead of series.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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