- Electric Charges and Fields Class 12 Case Study Questions Physics Chapter 1
Last Updated on September 4, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 12 physics. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 12 physics. In this article, you will find case study questions for cbse class 12 physics chapter 1 Electric Charges and Fields.
Table of Contents
Case Study Questions on Electric Charges and Fields
Question 1:
Surface charge density is defined as charge per unit surface area of surface charge distribution. i.e., $\sigma=\frac{d q}{d s}$. Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs having magnitude of $17.0 \times 10^{-22} \mathrm{Cm}^{-2}$ as shown. The intensity of electric field at a point is $E=\frac{\sigma}{\varepsilon_0}$, where $\varepsilon_0=$ permittivity of free space.
(i) $E$ in the outer region of the first plate is (a) $17 \times 10^{-22} \mathrm{~N} / \mathrm{C}$ (b) $1.5 \times 10^{-25} \mathrm{~N} / \mathrm{C}$ (c) $1.9 \times 10^{-10} \mathrm{~N} / \mathrm{C}$ (d) zero (ii) $E$ in the outer region of the second plate is (a) $17 \times 10^{-22} \mathrm{~N} / \mathrm{C}$ (b) $1.5 \times 10^{-15} \mathrm{~N} / \mathrm{C}$ (c) $1.9 \times 10^{-10} \mathrm{~N} / \mathrm{C}$ (d) zero (iii) $E$ between the plates is (a) $17 \times 10^{-22} \mathrm{~N} / \mathrm{C}$ (b) $1.5 \times 10^{-15} \mathrm{~N} / \mathrm{C}$ (c) $1.9 \times 10^{-10} \mathrm{~N} / \mathrm{C}$ (d) zero (iv) The ratio of $E$ from right side of $B$ at distances 2 cm and 4 cm , respectively is (a) $1: 2$ (b) $2: 1$ (c) $1: 1$ (d) $1: \sqrt{2}$ (v) In order to estimate the electric field due to a thin finite plane metal plate, the Gaussian surface considered is (a) spherical (b) cylindrical (c) straight line (d) none of these
(i) Option (d) is correct.
There are two plates $A$ and $B$ having surface charge densities,
$$ \sigma_A=17.0 \times 10^{-22} \mathrm{C} / \mathrm{m}^2 $$
on $A$ and $\sigma_B=-17.0 \times 10^{-22} \mathrm{C} / \mathrm{m}^2$ on $B$, respectively. According to Gauss’ theorem, if the plates have same surface charge density but having opposite signs, then the electric field in region I is zero.
$$ E_{\mathrm{I}}=E_A+E_B=\frac{\sigma}{2 \varepsilon_0}+\left(-\frac{\sigma}{2 \varepsilon_0}\right)=0 $$
(ii) (d): The electric field in region III is also zero.
$$ E_{\mathrm{III}}=E_A+E_B=\frac{\sigma}{2 \varepsilon_0}+\left(-\frac{\sigma}{2 \varepsilon_0}\right)=0 $$
(iii) (c): In region II or between the plates, the electric field
$$ \begin{aligned} & E_{\mathrm{II}}=E_A-E_B=\frac{\sigma}{2 \varepsilon_0}+\frac{\sigma}{2 \varepsilon_0} \\ &=\frac{\sigma\left(\sigma_A \text { or } \sigma_B\right)}{\varepsilon_0}=\frac{17.0 \times 10^{-22}}{8.85 \times 10^{-12}} \\ & E=1.9 \times 10^{-10} \mathrm{NC}^{-1} \end{aligned} $$
(iv) (c): Since, electric field due to an infinite-plane sheet of charge does not depend on the distance of observation point from the plane sheet of charge. So, for the given distances, the ratio of $E$ will be $1: 1$. (v) (b): In order to estimate the electric field due to a thin finite plane metal plate, we take a cylindrical cross-sectional area $A$ and length $2 r$ as the gaussian surface.
Case study questions for other chapters of class 12 physics is given below.
Case Study Questions for Class 12 Physics
We hope the given case study questions for Electric Charges and Fields Class 12 helps you in your learning.
Topics from which case study questions may be asked
- Electric charges
- Conservation of charge
- Coulomb’s law – force between two-point charges
- Forces between multiple charges
- Superposition principle
- Continuous charge distribution
- Electric field
- Electric field due to a point charge
- Electric field lines
- Electric dipole
- Electric field due to a dipole
- Torque on a dipole in a uniform electric field
- Electric flux
- Statement of Gauss’s theorem
- Applications of Gauss’s theorem to find field due to: Infinitely long straight wire Uniformly charged infinite plane sheet Uniformly charged thin spherical shell (field inside and outside)
Two electric field lines never cross each other. If they intersect, then there will be two directions of electric field at the point of intersection which is not possible.
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Frequently Asked Questions (FAQs) on Electric Charges and Fields Case Study Questions
Q1: what are case study questions for cbse examinations.
A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.
Q2: Why are case study questions important for understanding class 12 physics chapters?
A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.
Q3: How should students approach answering case study questions for CBSE?
A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.
Q4: Are there any resources available online for students to practice case study questions on class 12 physics chapters for CBSE exams?
A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.
Q5: How can students effectively prepare for case study questions on “Electric Charges and Fields” for CBSE exams?
A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.
Q6: How can teachers incorporate case study questions on “Electric Charges and Fields” class 12 physics into classroom teaching?
A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of “Electric Charges and Fields”.
Q7: Electrostatic forces are much stronger than gravitational forces. Give one example.
A7: A charged glass rod can lift a piece of paper against the gravitational pull of the earth on this piece.
Q8: What is an electric line of force? What is its importance?
A8: An electric line of force is an imaginary straight or curved path along which a small positive test charge is supposed to move when free to do so. The tangent at a point on an electric line of force gives the direction of the resultant electric field at that point. The relative closeness of electric lines of force in a certain region provides us an estimate of the electric field strength in that region
Q9: Can a charged body attract another uncharged body? Explain.
A9: Yes, a charged body can attract another uncharged body. When the charged body is placed near the uncharged body, the induced charges of opposite kind are produced on the uncharged body and the uncharged body is attract by charged body.
Q10: In Coulomb’s law, on what factors the value of electrostatic force constant K depends?
A10: It depends on the nature of medium between the two charges and also on the system of units.
Q11: Is the mass of a body affected on charging?
A11: Yes, very slightly. The negatively charged body gains mass also along with electrons.
Q12: How does a free electron at rest move in an electric field?
A12: When the electron is released, it will move in a direction opposite to the direction of electric field.
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Case Study on Electric Charges and Fields Class 12 Physics PDF
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4 Tips to Answer Class 12 Physics Electric Charges and Fields Case Study Questions?
There are 4 solid tips to answer Class 12 Physics Electric Charges and Fields Case Study questions that we are discussing in this section.
- Read the Case Carefully: To start gathering insights from the given case-based questions, it is vital to read the Electric Charges and Fields case carefully and identify the key facts, figures, and units of measurement. Pay attention to any diagrams or graphs related to Electric Charges and Fields provided, as they may contain important information.
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- Use Elimination Methods Too: Since case study questions of Class 12 Physics Electric Charges and Fields, are often framed in Multiple choice questions, students should have the knowledge of elimination methods in MCQs to better answer the questions.
- Before All, Master the Concept of Electric Charges and Fields: If the above two methods are not working for you to answer Case Study on Electric Charges and Fields Class 12 Physics then you need to revisit the lesson and master the concepts explained in the Electric Charges and Fields Class 12 Physics.
What is the Benefit of Practising Class 12 Physics Electric Charges and Fields Case Study Questions?
When a student decides to practise Class 12 Physics Electric Charges and Fields case study questions before the board examination they generally get these 3 benefits:
- Quick Conceptual Revision: Nothing is better for revision than solving relevant questions and therefore, those who involve in solving the Electric Charges and Fields Case study questions before the Class 12 Physics exam are able to better revise their conceptual learnings from the lesson.
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