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WBJEE: Important Questions and Preparation Tips – Alternating Current

In this article, our Subject Experts of Physics bring to you concise chapter notes of chapter Alternating Current including detailed concepts about all important topics like ac voltage applied to a resistor, ac voltage applied to a capacitor, ac voltage applied to a series LCR circuit etc. About 1-2 questions are always asked from this chapter in WBJEE examination.

Nov 21, 2017 14:54 IST
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WBJEE 2018: Alternating Current
WBJEE 2018: Alternating Current

Find chapter notes of chapter Alternating current including important concept, formulae and some solved questions for WBJEE Examination 2018. These notes are based on the latest syllabus of WBJEE examination.

About the Chapter Notes:

Chapter notes play a very important role to crack any engineering examination. Chapter notes should consist of important concepts, formulae and some solved questions based on the concepts which are explained in the notes.

These chapter notes consist all important topics related to chapter Alternating Current like ac voltage applied to a resistor, ac voltage applied to an inductor, ac voltage applied to a capacitor, ac voltage applied to a series LCR circuit etc.

These chapter notes are prepared by Subject Experts after the detailed analysis of the pattern of last few year papers.

About the Exam:

West Bengal Joint Entrance Examination (WBJEE) is a state level common entrance test organized by West Bengal Joint Entrance Examinations Board for admission to the Undergraduate Level Engineering and Medical Courses through a common entrance test in the State of West Bengal.

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Important Concepts:

WBJEE alternating current concepts 1

WBJEE alternating current concepts 2

WBJEE alternating current concepts 3

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Some solved questions are given below:

Question 1:

WBJEE Alternating Current Question 1

Solution 1:

 WBJEE Alternating Current Solution 1

Hence, the correct option is (b).

Question 2:

WBJEE Alternating Current Question 2

Solution 2:

WBJEE Alternating Current Solution 2

Hence, the correct option is (c).

Important Questions and Preparation Tips – Electric Current

Question 3:

For given LR circuit, growth of current as function of time t is shown in graph. Which of the following option represents value of time constant most closely for the circuit?

WBJEE Alternating Current Question 3

(a) 0.4 s

(b) 0.7 s

(c) 1 s

(d) 2.4 s

Solution 3:

In one time constant 63% change occurs in the value of current. The 63% of maximum current is 1.26 A. It is obvious from the graph that current 1.26 A corresponds to time which is slightly greater than 0.9 sec.

Hence, the correct option is (c).

Question 4:

WBJEE Alternating Current Question 4

Solution 4:

WBJEE Alternating Current Solution 4

Hence, the correct option is (c).

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