Physics Class 12: Chapter 8 Electromagnetic Waves. 60. (i) two positive charges q2 and q3 fixed along the y-axis, exert a net electric force in the +x direction on a charge q1 fixed along the x-axis. If a body contains n1 electrons and n2 protons, then what will be the total amount of charge on the body? Define the dielectric constant of a medium. 55. Following are some advantages of preparing from NCERT solutions: Covers all the complex and straightforward topics. Solving the question at the end of the chapter will tell you how well you have learned them with NCERT Solutions for Class 12 Physics. Two similar spheres having +Q and -Q charges are kept at a certain distance. SaralStudy provides you with the detailed information on all the topics so that you will not have any queries left unanswered after finishing this chapter on this site. (a) Heisenberg uncertainty priniciple Which of the following statements is not true about Gauss’s law? You can study and download these question and their solutions free from this page. Students can solve NCERT Class 12 Physics Electric Charges and Fields MCQs Pdf with Answers to know their preparation level. When both electrical and magnetic effects are present, the interaction between charges is referred to as electromagnetic. 2. 49. (b) large velocity of the minority charge carriers if the doping concentration is large This chapter contains a bit of the previous chapter’s information about magnetism and matter too. Magnetism is one of the most essential and critical concepts for the board exams; therefore, you need to put more focus on the same. These solutions are solved by our specialists at SaralStudy.com, that will assist all the students of respective boards, including CBSE, who follows NCERT; with tackling all the questions easily. (d) Gauss’s law is based on the inverse square dependence on distance contained in the coulomb’s law, 34. Answer: Explaination: Same in magnitude and opposite in the direction as F = e.E. (c) discontinuous only if there is a negative charge at that point. Which of the following figures represent the electric field lines due to a single negative charge? The chapter comprises ten topics in total, and teach you about the concept of magnetic induction, magnetic flux, inductance, eddy currents and a lot more. (d) none of these, 2. Physics Class 12: Chapter 3 Current Electricity. If the charges are halved and distance between them is doubled, then the new force acting on each charge is, Answer: d Explaination: (d) F = . A conducting sphere of radius 10 cm has an unknown charge. Oops! As the dielectric constant K = oo for metals and the induced charge is given by q’ = . CBSE Class 12 Physics Notes Electrostatics – What Is Electric Potential? At points outside the region (a) the electric field is necessarily zero. 15. All of these three topics; displacement current, electromagnetic waves, and the electromagnetic spectrum are interrelated and based on the common concept of magnetism. 21. What do you mean by conservative nature of the electric force? Physics is one of the most feared subjects in class 12 because of its complex theories and physics formulas list. (d) none of these. Physics Class 12: Chapter 7 Alternating Current. Physics is involved in remembering and understanding a number of physics formulas and their concepts. In addition, you will also study about the related laws and theorems like the Gauss’ Law. (d) none of these, 14. (b) majority carriers only 31. Force F exerted by a charge Q on a charge q Physics Formula - 7. Physics class 12 is one of the most crucial subjects for science students. The force between the two charges will reduce by 1/K, where K is the dielectric constant of plastic. (b) It depends on medium between the two charges. Which of the following graphs shows the variation of electric field E due to a hollow spherical conductor of radius R as a function of distance from the centre of the sphere? If you have any query regarding CBSE Class 12 Physics Electric Charges and Fields MCQs Pdf, drop a comment below and we will get back to you at the earliest. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of Q/q should be (a) 2:1 (b) 1/2 (c) 4:1 (d) 1/4, Answer: a Explaination: (a) Let separation between two parts be r, then F = k.q(Q – q)/r² , For F to be maximum dF/dq = 0 then Q/q = 2/1 = 2 : 1, 7. (d) None of these, 3. You get detailed knowledge and understanding about alternating currents and its application in resistor, LCR series circuit, peak and RMS value of alternating voltage, reactance, impedance, LC oscillations, resonance and power in AC circuits, AC generator and transformer, watt-less current, etc. (d) gives protons to silk. Answer: Explaination: Infinite [Dielectric constant K = Permittivity of metals () is assumed to be very high. Saralstudy provides you with the detailed reference solutions ready for you for understanding the chapters completely. Answer: Explaination: Same charge will be induced on both the spheres. (b) covalent [AI 2014]. Answer: Explaination: One coulomb is that charge, when placed in vacuum at a distance of one metre from an equal and similar charge, would repel it with a force of 9 à 109 N. 50.