Many important questions are formed in competitive exams like CUET, JEE, NEET, and boards from Class 12 Physics Unit 2. Below, we have provided Important Questions from Class 12 Physics Unit 2 Current Electricity for your JEE Mains 2023 preparation. You can check it here for revision purposes.
Latest: Electrostatics Class 12 JEE Questions and Answers
Electrostatics Class 12 JEE Mains Questions and Answers
We’ve compiled a list of important questions about the Current electricity physics class 12 unit 2 that you should not miss while studying for your JEE Main Exams.
Q.1. In the circuit shown, find the ratio of the power developed across 2 Ω, 4 Ω, and 6 Ω.
(a) 4 : 2 : 27
(b) 3 : 2 : 27
(c) 2 : 3 : 19
(d) 4 : 2 : 19
A.1. (a)
Explanation:
Q.2. Find the current flowing through the 6 Ω resistor in the given circuit.
(a) 5/11 A
(b) 20/11 A
(c) 8/9 A
(d) 3/7 A
A.2. (b)
Explanation:
Q.3. The total current supplied to the circuit by the battery is
(a) 1 A
(b) 2 A
(c) 4 A
(d) 6 A
A.3. (c)
Explanation:
Q.4. Current flows through a constricted conductor, as shown in the figure. The diameter D1 = 2.0 mm and the current density to the left of the constriction is j = 1.27 × 106 A m–2. (i) What current flows into the constriction? (ii) If the current density is doubled as it emerges from the right side of the constriction, what is diameter D2?
(a) 2.3 A, 1.1 mm
(b) 1.5 A, 2 mm
(c) 4.0 A, 1.4 mm
(d) 1.7 A, 2.3 mm
A.4. (c)
Explanation:
Q.5. Find the equivalent resistance between A and B.
(a) 5 Ω
(b) 7 Ω
(c) 10 Ω
(d) 9 Ω
A.5. (b)
Q.6. Consider the four circuits shown in the figure below. In which circuit power dissipated is greatest? (Neglect the internal resistance of the power supply)
A.6. (a)
Explanation:
Q.7. Two wires A and B of equal mass and of the same metal are taken. The diameter of wire A is half the diameter of wire B. If the resistance of wire A is 24 Ω, calculate the resistance of wire B.
(a) 2 Ω (b) 1.5 Ω (c) 2.5 Ω (d) 4 Ω
A.7. (b)
Explanation:
Q.8. A current of 30 A is flowing through a wire of cross-sectional area 2 mm2. Assuming the temperature of the wire to be 27°C, calculate the ratio of rms velocity to the drift velocity at this temperature. Given that Boltzmann’s constant = 1.38 × 10–23 J K–1,the density of copper = 8.9 g cm–3, atomic mass of copper = 63.
(a) 105 (b) 106 (c) 107 (d) 108
A.8. (d)
Q.9. A voltmeter of resistance 998 Ω is connected across a cell of emf 2 V and internal resistance 2 Ω. Find the potential difference across the voltmeter.
(a) 2.004 V (b) 1.996 V(c) 1.978 V (d) 1.992 V
A.9. (b)
Explanation:
Q.10. The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be
(a) 200 % (b) 100 % (c) 50 % (d) 300 %
A.10. (d)
Best JEE Books Recommended by JEE Toppers
Check out some of the best JEE Books recommended by JEE Toppers
- NCERT Textbook
One thing that is strongly recommended is that students prepare using NCERT textbooks. Toppers endorse NCERT as the finest book for JEE Main. NCERT is the foundation for these exams since they cover everything and consist of enormous information. Each and every line of NCERT must be clear and embedded in your mind to know the concepts better.
 |
NCERT At Your Fingertips As we mentioned in the point above, each and every line of NCERT is important. NCERT At Your Fingertips is just the book for that purpose as it has over 100 MCQs from every line of NCERT and provides deep learning. It has MCQs pulled out from NCERT, NCERT Exemplar, previous years’ papers, practice papers, and model test papers. The book is a bestseller on every e-commerce platform and has been referred by teachers and lakhs of JEE toppers and aspirants as a jewel for JEE exam preparation. It has over 8000 5-star ratings and reviews on amazon alone. You can’t miss out on this book for extensive knowledge.
|
|
JEE Main Guide This series has separate books for physics, chemistry, and mathematics. MTG JEE Main Physics is the best book for JEE Main exam based on the latest pattern. The book comprises detailed theory with illustrations followed by Self-check MCQs. Chapter-wise MCQs and Numerical Value Questions with Hints and explanations are included for better understanding. |
 |
|
|
22 Years JEE Main Imagine having 21 years’ worth of experience for JEE Main? That is what you’ll get with this series of Physics, chemistry, and mathematics books. MTG’s 22 Years JEE Main Chapter-wise Topic-wise Solutions Physics is the best question bank having questions from the past 22 years of JEE Main Physics (2022-2013) & AIEEE (2012-2002) which are segregated Chapter-wise Topic-wise. |
|
NTA JEE Main This book for excelling in JEE MAIN has the real 104 online papers by NTA from 2019 to 2023. The book also provides 5 Mock test papers as per the latest pattern of JEE Main exam set by NTA in the end. MCQs and Numerical type questions are present in the book along with chapter-wise graphical analysis indicating the weightage of questions and topics. |
 |
|
|
JEE Champion JEE Champion is a book designed for JEE aspirants to prepare better with the knowledge of topic importance within a chapter. It familiarizes all the JEE aspirants with a wide variety of questions frequently asked in various engineering entrance exams. It covers 10 years of questions for all the major engineering exams. Students can understand the changing pattern of questions asked and can gain mastery over questions asked during exams.
|
|
46 Years JEE Advanced • 46 years of IIT-JEE/ JEE Advanced previous year questions |
 |
|
|
46+22 Years Chapterwise Topicwise Solutions • 46 Previous Years’ Papers of JEE Advanced/IIT JEE |
