Neco 2022 Physics Question 42

Practice objective / multiple choice question 42 from the 2022 Neco Physics examination.

Neco 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 42 NECO • 2022 • PHYSICS • objective

A battery of emf \(E\) and internal resistance \(r\) is connected to two resistors \(R_{1}=6\ \Omega\) and \(R_{2}\) placed in parallel. The total current supplied by the battery is \(2.0\ \text{A}\). The power dissipated in \(R_{1}\) is twice the power dissipated in \(R_{2}\). The efficiency of the circuit (ratio of power delivered to the external resistors to the total power supplied by the battery) is \(80\%\). Determine (i) the value of \(R_{2}\), (ii) the internal resistance \(r\), and (iii) the emf \(E\) of the battery.

Answer Options

A. R_{2}=12\ \Omega, r=2\ \Omega, E=10\ \text{V}
Correct Answer B. R_{2}=12\ \Omega, r=1\ \Omega, E=10\ \text{V}
C. R_{2}=6\ \Omega, r=1\ \Omega, E=8\ \text{V}
D. R_{2}=8\ \Omega, r=2\ \Omega, E=12\ \text{V}
Correct Answer
B
Correct Option:
R_{2}=12\ \Omega, r=1\ \Omega, E=10\ \text{V}

About This Question

This is Neco 2022 Physics Question 42. It is one of the objective questions from the 2022 Neco Physics examination.

Difficulty level: Hard .

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