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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
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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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Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Project Topics and Materials, Post-UTME past questions - Download now or upload yours to get paid
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts