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A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If...

Physics
JAMB 2000

A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is

  • A. 8V
  • B. 10V
  • C. 12V
  • D. 16V
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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Correct Answer: Option C
Explanation

In a circuit where the cell is rightly connected, two similar poles should not come side by side.
ET = 2v + 2v + 2v + 2v + 2v + 2v + (2v - 2v) [(2v - 2v) due to wrong connection]
ET = 12V OR

Net e.m.f = (8 x 2) - (2 x 2)

= 12V

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709