Neco 2020 Physics Question 5

Practice objective / multiple choice question 5 from the 2020 Neco Physics examination.

Neco 2020 Physics Objective / Multiple Choice Hard Difficulty
Question 5 NECO • 2020 • PHYSICS • objective

A battery of emf \(12\ \text{V}\) and internal resistance \(0.5\ \Omega\) is connected to a circuit consisting of a \(4\ \Omega\) resistor (R1) in series with a parallel combination of a \(6\ \Omega\) resistor (R2) and an unknown resistor R3. The total current drawn from the battery is measured to be \(1.2\ \text{A}\).\n(a) Determine the resistance value of R3.\n(b) Find the potential difference across R2.\n(c) If R3 is replaced by a perfect wire (0 \Omega), what is the new total current supplied by the battery?

Answer Options

A. R3 = 66 Ω; V_R2 = 5.5 V; New total current = 2.67 A
B. R3 = 72 Ω; V_R2 = 7.2 V; New total current = 2.8 A
Correct Answer C. R3 = 66 Ω; V_R2 = 6.6 V; New total current = 2.67 A
D. R3 = 60 Ω; V_R2 = 5.5 V; New total current = 2.5 A
Correct Answer
C
Correct Option:
R3 = 66 Ω; V_R2 = 6.6 V; New total current = 2.67 A

About This Question

This is Neco 2020 Physics Question 5. It is one of the objective questions from the 2020 Neco Physics examination.

Difficulty level: Hard .

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