Chapter 14: Problem 2062
The resistance of a coil for dc is in ohms. In ac, the resistance (a) will remain same (b) will increase (c) will decrease (d) will be zero
Chapter 14: Problem 2062
The resistance of a coil for dc is in ohms. In ac, the resistance (a) will remain same (b) will increase (c) will decrease (d) will be zero
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Get started for freeThe 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) \(0.88 \mathrm{~A}\)
A transformer of efficiency \(90 \%\) draws an input power of \(4 \mathrm{~kW}\). An electrical appliance connected across the secondary draws a current of $6 \mathrm{~A}$. The impedance of device is ....... (a) \(60 \Omega\) (b) \(50 \Omega\) (c) \(80 \Omega\) (d) \(100 \Omega\)
A coil of inductance \(300 \mathrm{mH}\) and resistance \(2 \Omega\) is connected to a source of voltage \(2 \mathrm{~V}\). The current reaches half of its steady state value in \(\ldots \ldots\) (a) \(0.15 \mathrm{sec}\) (b) \(0.3 \mathrm{sec}\) (c) \(0.05 \mathrm{sec}\) (d) \(0.1 \mathrm{sec}\)
A circular loop of radius \(\mathrm{R}\) carrying current I lies in \(\mathrm{X}-\mathrm{Y}\) plane with its centre at origin. The total magnetic flux through \(\mathrm{X}-\mathrm{Y}\) plane is...... (a) Directly proportional to I (b) Directly proportional to \(\mathrm{R}\) (c) Directly proportional to \(\mathrm{R}^{2}\) (d) Zero
In circular coil. when no. of turns is doubled \& resistance becomes half of the initial then inductance becomes ...... (a) 4 times (b) 2 times (c) 8 times (d) No change
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