Chapter 14: Problem 2070
In ac circuit with voltage \(\mathrm{V}\) and current \(\mathrm{I}\), the power dissipated is. (a) VI (b) \((1 / 2) \mathrm{VI}\) (c) \((1 / \sqrt{2}) \mathrm{VI}\) (d) Depends on the phase between \(\mathrm{V}\) and I
Chapter 14: Problem 2070
In ac circuit with voltage \(\mathrm{V}\) and current \(\mathrm{I}\), the power dissipated is. (a) VI (b) \((1 / 2) \mathrm{VI}\) (c) \((1 / \sqrt{2}) \mathrm{VI}\) (d) Depends on the phase between \(\mathrm{V}\) and I
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Get started for freeA metal road moves at a constant velocity in a direction perpendicular to its length \& a constant uniform magnetic field too. Select the correct statement (s) from the following. (a) The entire rod is at the same electrical potential (b) There is an electric field in the rod (c) The electric potential is highest at the centre of the rod. (d) The electric potential is lowest at the centre of the rod.
In an ac circuit the emf (e) and the current (i) at any instant core given respectively by \(\mathrm{e}=\mathrm{E}_{\mathrm{O}}\) sin $\operatorname{ct}, \mathrm{I}=\mathrm{I}_{\mathrm{O}} \sin (\cot -\Phi)$. The average power in the circuit over one cycle of ac is. (a) \(\left[\left\\{E_{O} I_{O}\right\\} / 2\right] \cos \Phi\) (b) \(\mathrm{E}_{\mathrm{O}} \mathrm{I}_{\mathrm{O}}\) (c) \(\left[\left\\{E_{Q} I_{Q}\right\\} / 2\right]\) (d) \(\left[\left\\{E_{O} I_{O}\right\\} / 2\right] \sin \Phi\)
The self inductance of a coil is \(5 \mathrm{H}\), a current of \(1 \mathrm{~A}\) changes to \(2 \mathrm{~A}\) within \(5 \mathrm{sec}\). through the coil. The value of induced emf will be \(\ldots \ldots\) (a) \(10 \mathrm{~V}\) (b) \(0.1 \mathrm{~V}\) (c) \(1 \mathrm{~V}\) (d) \(100 \mathrm{~V}\)
The time constant of a LR circuit is \(80 \mathrm{~ms}\), The circuit is connected at \(t=0\) and the steady state current is found to be $4 \mathrm{~A}\(. Find the current at \)20 \mathrm{~ms}$. (a) \(0.98 \mathrm{~A}\) (b) \(1 \mathrm{~A}\) (c) \(0.44 \mathrm{~A}\) (d) \(0.88 \mathrm{~A}\)
Two coils of self inductances \(2 \mathrm{mH} \& 8 \mathrm{mH}\) are placed so close together that the effective flux in one coil is completely half with the other. The mutual inductance between these coils is...... (a) \(4 \mathrm{mH}\) (b) \(6 \mathrm{mH}\) (c) \(2 \mathrm{mH}\) (d) \(16 \mathrm{mH}\)
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