Neco 2022 Physics Question 37
Practice objective / multiple choice question 37 from the 2022 Neco Physics examination.
A coil of \(200\) turns and area \(0.04\) m\(^{2}\) rotates in a uniform magnetic field of \(0.5\) T. The maximum emf observed at the original angular speed is \(12\) V. When the coil is driven at half this angular speed, a resistor \(R\) is connected across the coil. The rms voltage measured across the resistor is \(4.2\) V. If the coil has an internal resistance of \(2\) \(\Omega\), determine the value of \(R\) (give your answer to the nearest ohm).
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About This Question
This is Neco 2022 Physics Question 37. It is one of the objective questions from the 2022 Neco Physics examination.
Difficulty level: Hard .
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