Mixed Worksheet for Chapter 7 - Alternating Current
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Sample questions
(a) Discuss the behaviour of an inductor connected to (i) a dc source, and (ii) a high frequency ac source.
(b) What is the phase relation between current and voltage in an ideal inductor connected to an ac source ? Draw a phasor diagram for the circuit.
(i) A light bulb and an open coil inductor are connected in series across an ac source of variable frequency. How will the glow of the bulb be affected when :
(I) an iron bar is inserted inside the coil, and
(II) the frequency of the source is decreased ?
Justify your answers. Assume that in each above case other factors remain unchanged.
(ii) An ac voltage V = 280 sin (100π t) volt is connected across a series LCR circuit in which R = 400 Ω, L = \(\frac{5}{π}\) H and C = \(\frac{50}{π}\) μF. Taking \({{\sqrt{2}}}\) = 1·4, calculate :
(I) impedance of the circuit.
(II) rms value of current that flows in the circuit.
(III) power factor of the circuit.
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About this Mixed Worksheet
This mixed worksheet is designed for Class 12 Physics practice from Chapter 7 - Alternating Current. It uses the question types selected for this worksheet and keeps the preview representative of the complete set.
Solve the questions first, then use the separate answer key to check the method and identify concepts that need revision. For more practice, continue with the chapter quiz or another worksheet below.
Frequently asked questions
How many questions are in this mixed worksheet?
The complete worksheet contains 10 questions. This page shows a fixed preview of 2 questions.
Does the worksheet include answers?
Yes. The complete download includes a questions PDF and a separate answer key PDF.
Do the sample questions change when the page is refreshed?
No. The preview is fixed and is the same for every visitor. The downloaded worksheet is generated separately.
How should I use this mixed worksheet?
Attempt the questions without the answer key, check each solution afterwards, and revise the linked chapter concepts before trying another worksheet or quiz.