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Consider an ac circuit where an incandescent light bulb is in series with an inductor. If the frequency of the generator is increased, what will happen to the brightness of bulb?

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Important Questions on Alternating Current

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.2>Q 13
In series LCR AC circuit, the voltage of the source at any instant is equal to
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.3>Q 16

Switch is in position A for a long time. At time 0, it is switched to position B. Find the maximum charge which will accumulate on capacitor.

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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.3>Q 18
A 16 μF capacitor is charged to 20 V. The battery is then disconnected and a pure 40 mH coil is connected across the capacitor, so that LC oscillations are set up. The maximum current in the coil is
 
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>EXERCISE 7.3>Q 19
In oscillating LC circuit, the total stored energy is U and maximum charge upon capacitor is Q. When the charge upon the capacitor is Q2, the energy stored in the inductor is
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>Assignment Set-2>Q 2
10 kJ/s of heat is produced when a DC flows through a 100Ω resistor. Which of the following ac produces nearly same heat per sec through the same resistor?
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>Assignment Set-2>Q 4
The average value of a saw-tooth voltage V=V02tT-1. Over 0 to T2; (T -time period) is given by
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>Assignment Set-2>Q 6
A charged capacitor and an inductor are connected in series. At time t=0, the current is zero but the capacitor is charged. If T is the period of resulting oscillations, then the time after which current in the circuit becomes maximum, is
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Gamma Question Bank for Engineering Physics>Chapter 21 - Alternating Current>Assignment Set-2>Q 7
In a series sinusoidally driven LCR AC circuit, the current lags the applied emf. The rate at which energy is dissipated in the resistor, can be increased by