Neco Model Questions Vol1 2025 Physics Question 32
Practice objective / multiple choice question 32 from the 2025 Neco Model Questions Vol1 Physics examination.
A copper wire of length \(20\ \text{m}\) and cross‑sectional area \(1.0\ \text{mm}^2\) carries a steady current of \(5\ \text{A}\). The resistivity of copper at \(20^{\circ}\text{C}\) is \(1.68\times10^{-8}\ \Omega\!\cdot\!\text{m}\) and its temperature coefficient of resistance is \(\alpha = 0.004\ \text{°C}^{-1}\). When the wire warms up, the power dissipated in it increases by \(12\%\) while the current remains unchanged. Determine the temperature rise \(\Delta T\) of the wire.
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This is Neco Model Questions Vol1 2025 Physics Question 32. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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