Neco Model Questions Vol1 2024 Physics Question 44

Practice objective / multiple choice question 44 from the 2024 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2024 Physics Objective / Multiple Choice Hard Difficulty
Question 44 NECO_MODEL_QUESTIONS_VOL1 • 2024 • PHYSICS • objective

A 12 V battery has an internal resistance of \(0.5\ \Omega\). It is connected to a parallel network as shown: branch A consists of a resistor \(R_{1}=4\ \Omega\) in series with a bulb of unknown resistance \(R_{b}\); branch B consists of a single resistor \(R_{2}=6\ \Omega\). When the circuit is first assembled, the bulb draws a current of \(2.0\ \text{A}\). (i) Determine the resistance of the bulb \(R_{b}\). (ii) Find the total current supplied by the battery and the power dissipated in the bulb. (iii) If resistor \(R_{2}\) is removed, recompute the total current and the bulb's power, and state the percentage increase in the bulb's power.

Answer Options

A. R_b≈2.00 Ω; total I≈3.20 A, bulb power≈3.84 W; after removing R2: I≈2.50 A, bulb power≈5.20 W, increase≈35.4 %
B. R_b≈0.50 Ω; total I≈4.10 A, bulb power≈5.12 W; after removing R2: I≈2.80 A, bulb power≈5.60 W, increase≈9.4 %
Correct Answer C. R_b≈1.08 Ω; total I≈3.69 A, bulb power≈4.31 W; after removing R2: I≈2.15 A, bulb power≈4.99 W, increase≈15.8 %
D. R_b≈1.50 Ω; total I≈3.00 A, bulb power≈3.60 W; after removing R2: I≈1.90 A, bulb power≈4.30 W, increase≈19.4 %
Correct Answer
C
Correct Option:
R_b≈1.08 Ω; total I≈3.69 A, bulb power≈4.31 W; after removing R2: I≈2.15 A, bulb power≈4.99 W, increase≈15.8 %

About This Question

This is Neco Model Questions Vol1 2024 Physics Question 44. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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