Neco Model Questions Vol1 2023 Physics Question 46
Practice objective / multiple choice question 46 from the 2023 Neco Model Questions Vol1 Physics examination.
A rectangular coil of 50 turns has initial dimensions 0.10 m by 0.20 m and lies in a uniform magnetic field that is perpendicular to the plane of the coil. The magnetic field varies with time as \(B(t)=0.2t^{2}\) tesla (t in seconds). Starting at \(t=3\ \text{s}\) the side of length 0.20 m begins to contract at a constant rate of \(0.01\ \text{m s}^{-1}\) while the other side remains unchanged. The coil is connected to an external resistor of \(10\ \Omega\) and has an internal resistance of \(2\ \Omega\). What is the power (in watts, to two decimal places) dissipated in the external resistor at \(t=4\ \text{s}\)?
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About This Question
This is Neco Model Questions Vol1 2023 Physics Question 46. It is one of the objective questions from the 2023 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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