SAMPLE PAPER-2013 CLASS-XII Subject : Physics Time allowed : 3 hours Maximum Marks : 70 General Instructions : i) All questions are compulsory. ii) Question numbers 1 to 8 are very short answer type questions‚ carrying one mark each. iii) Question numbers 9 to 18 are short answer type questions ‚ carrying two marks each. iv) Question numbers 19 to 27 are also short answer type questions‚ carrying three marks each. v) Question numbers 28 to 30 are long answer type questions
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Fundamental of Electronics Nature: Term Paper 1. What device is used to store electric charge? - A capacitor is used to store energy or electric charge in electric field while inductor is used to store energy in magnetic field. 2. What quantity indicates the amount of stored electric charge? - The quantity that indicates the amount of stored electric charge is the Electric Potential. 3. Compare the laws for resistors in series and parallel with those for capacitors in series and parallel
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L&T SWITCHGEAR SAFE & SURE ELECTRICAL SAFETY E S P SERVICE MANUAL GENERAL Electricity is good servant but bad master. It can prove to be very dangerous if circuits are not properly protected. The major fault that appears in electrical network or equipment is termed as short circuit. In short circuit‚ the supply phase and neutral or earth is short circuited accidentally due to foreign metallic substance coming in contact with phase & neutral or earth or due to overload thereby damaging
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Have modern technologies made the world better place? Most past of contemporary people cannot imagine their life without different devices‚ because they have to use it every day. Considering only our cell-phones or smartphones: we call‚ we send text-messages‚ look for necessary (or not) information in the internet‚ make notes‚ etc. We can use computer for a large amount of things‚ from typing a paper or sending a complaint somewhere to creating a music or attending lecture in the different part
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Earth’s Magnetic Field Introduction Earth’s magnetic field is one of the world’s most complicated features. It started to be observed in 1845 by a scientist named Carl Friedman Gauss (Sarfati). The magnetic field is generated inside of the earth’s core and there are many scientists who still debate over how it was first created. There are also many arguments about the many changes that the field has gone through in it’s existence. These arguments are mostly either for a young-earth model or
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Series and Parallel Circuits Name:_____________________________________________ Directions: 1. Go to the following website: http://phet.colorado.edu/en/simulation/circuit-construction-kit-ac-virtual-lab 2. Click “Run now.” You now have the raw material to create a circuit. Take a moment to look over the site and find all the different materials. To build a circuit you will need several wires‚ a light bulb‚ a voltage source‚ a voltmeter‚ and a non – contact
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M.Sc Physics Syllabus IVth Semester-General Papers Course 4.1 Classical Electrodynamics. Unit –I Introduction to Electrostatics : Laws of electrostatics in vector notation coulomb’s law‚ Gauss’s law in integral and differential forms. Scalar potential. Surface distribution of charges and dipoles and discontinuity in the field and potential. Poisson’s and Laplace’s equations. Boundary conditions and uniquencess theorem. Potential energy and energy density of electrostatic field. Method
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Magnetic materials refer primarily to the materials with direct or indirect magnetism composed of transition elements like ferrum‚ cobalt‚ nickel and their alloys. Magnetic materials find application in wind power‚ electronics‚ computer‚ communication‚ medical treatment‚ household appliances and military fields. By quality and structure‚ magnetic materials can be classified into ferrite magnetic materials‚ rare earth magnetic materials‚ and others. In 2012‚ the number of flexible ferrite magnet
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Introduction Did you know that you probably used an electric motor today? Yes‚ that’s right. If you put on clothes that were washed in a washing machine‚ rode in a car‚ ate food from a fridge‚ warmed up lunch in a microwave‚ or played a video game‚ you used an electric motor! Try this science fair project and you’ll learn how to make a simple electric motor by having two magnets "talk" to each other. As they interact‚ they will alternate between "liking" each other (being pulled together)‚ and "disliking"
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It is very important to control the pendulum pulverizer feeder‚ which concerning the grinding efficiency and the quality of its granularity. The following passage will introduce the methods to control the pendulum feeder and its automatic feeding amount. The pulverizer feeder takes the electromagnetic vibrating way by using the double directional force of particles system. It’s made of the chute the coupling part and the armature. The whole electric vibrating feeder should hang in freely state
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