Download an excellent collection of questions with answers for CBSE Class 12 Physics
The collection will also be helpful for students of other syllabuses.
The file consists of syllabus, key points, collection of very short Answer (1 mark), Short answer type question – solved (2 marks), short answers (3 marks), Long answers (5 marks), Solved numericals and 3 sample papers.
The contents are arranged chapter-wise. Any student will find this a boon for easy preparation and to score better marks in Physics.
Download CBSE Physics Solved Board Question Papers 2008, 2009, 2010 & 2011 – All versions (Delhi, Outside Delhi & Foreign)
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CBSE Physics Class 12 Board Question Papers 2008 to 2011 all sets (SETS I, II & III) and versions (DELHI, FOREIGN, OUTSIDE DELHI)
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CHAPTER -12 ELECTRICITY
GIST OF THE LESSON
- Positive and negative charges: The charge acquired by a glass rod when rubbed with silk is called positive charge and the charge acquired by an ebonite rod when rubbed with wool is called negative charge.
- Coulomb: It is the S.I. unit of charge. One coulomb is defined as that amount of charge which repels an equal and similar charge with a force of 9 x 109 N when placed in vacuum at a distance of 1 meter from it. Charge on an electron = -1.6 x 10-19 coulomb.
- Static and current electricities: Static electricity deals with the electric charges at rest while the current electricity deals with the electric charges in motion.
- Conductor: A substance which allows passage of electric charges through it easily is called a ‘conductor’. A conductor offers very low resistance to the flow of current. For example copper, silver, aluminium etc.
- Insulator: A substance that has infinitely high resistance does not allow electric current to flow through it. It is called an ‘insulator’. For example rubber, glass, plastic, ebonite etc.
- Electric current: The flow of electric charges across a cross-section of a conductor constitutes an electric current. It is defined as the rate of flow of the electric charge through any section of a conductor.
Electric current = Charge/Time or I = Q/t
Electric current is a scalar quantity.
- Ampere: It is the S.I. unit of current. If one coulomb of charge flows through any section of a conductor in one second, then current through it is said to be one ampere. 1 ampere = 1 coulomb/1 second or 1 A = 1C/1s = 1Cs-1 1 milliampere = 1 mA = 10-3 A 1 microampere = 1µA = 10-6 A
- Electric circuit: The closed path along which electric current flows is called an ‘electric circuit’.
- Conventional current: Conventionally, the direction of motion of positive charges is taken as the direction of current. The direction of conventional current is opposite to that of the negatively charged electrons.
- Electric field: It is the region around a charged body within which its influence can be experienced. Continue reading “Quick Revision for Class X Physics SA1”
The Summative Assessment 1 is about to begin. As per request from student from various parts of India and abroad, we are publishing some solved sample papers in Physics, which we think, would help you in scoring better marks in the forthcoming SA1 exams.
(Based on Motion)
Class 9 Physics Sample Paper 1 Solved
Class 9 Physics Sample Paper 2 Solved
Download A Model Question paper for Class 10 CBSE Science Summative Assessment II
Click here to Download the Marking Scheme
We will publish here the portions one cannot afford to miss while preparing for the CBSE class 12 Physics Examination
The Chapters will be posted below. On Clicking the name of the chapter a new page will open. On that page there will be a set of collected questions. On clicking the questions, the complete solution to the questions will open.
Please note that this system is under preparation. We hope to complete this within a month. The link will be activated only after completing the project.
- CURRENT ELECTRICITY
- MAGNETIC EFFECTS OF CURRENT
- ELECTROMAGNETIC INDUCTION
- ALTERNATING CURRENT
- ELECTROMAGNETIC WAVES
- DUAL NATURE OF MATTER AND RADIATION
- ATOMS AND NUCLEI
- ELECTRONIC DEVICES
- COMMUNICATION SYSTEMS
If you find these question easy to answer, well and good. If you don’t, please revise these portions thoroughly. These are based on just the minimum level of learning expected from a Class XII student.
- State Gauss theorem in magnetism.
- Define the terms retentivity and coercivity.
- Which direction will a magnetic compass show when it is kept horizontally at the magnetic north pole of earth?
- Determine the magnitude and direction of magnetic field to be applied in a region with a vertical electric field 1000 V/m (downwards) where a proton has to move towards east with a speed of 100 m/s without any deflection. (Disregard the presence of earth’s magnetic field.)
- Derive expression for the force on a current carrying conductor in a uniform magnetic field.
- Using Ampere’s circuital law, derive an expression for the magnetic field at a point due to a straight conductor carrying current.
- The radius of the first electron orbit of a hydrogen atom is 0.5 A. The electron moves in this orbit with a uniform speed of 2.2 x 106 m/s. What is the magnetic field produced at the centre of the nucleus due to the motion of this elecetron?
- Derive the relation mr = 1+cm (relation between magnetic permeability and magnetic susceptibility)
- Mention the magnetic elements of earth and define each.
- Derive expression for the magnetic dipole moment of a revolving electron.
- Describe the principle, construction and working of a cyclotron. Why electrons cannot be accelerated using a cyclotron?
- Gauss theorem in magnetism states that closed surface integral of magnetic field in a closed surface is zero. That is, the net magnetic flux through a closed surface is always zero. Mathematically,
- Retentivity is the magnetization retained by a specimen when the magnetizing field is zero. Coercivity is the reverse magnetizing force required to completely demagnetize and specimen.
- The compass needle will not show any particular direction as the horizontal component is zero at the magnetic poles. It can rest in any direction in which it is placed just like a non-magnetic needle.