CLASS XII – SAMPLE PAPER
Time allowed : 3 hours
Max. Marks : 70
- All questions are compulsory
- There are 30 questions in total. Questions 1 to 8 carry one mark each, 9 to 18 carry two marks each, 19 to 27 carry 3 marks each and 28 to 30 carry 5 marks each.
- There is no overall choice, but internal choices are provided. You have to attempt only one choice in full.
- Use of calculator is not permitted.
- You may use the logarithm table, if required.
1. Express dielectric constant in terms of capacitance.
2. What is magnetic susceptibility?
3. Define electromagnetic induction. Read more…
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Eddy currents are circulating currents induced in the body of a solid conductor whenever the magnetic flux linked with it changes. It is called EDDY CURRENT because they are like eddies formed in water.
I have read that the FLOW OF ELECTRONS is called electricity. I wanna know that what is meant by flow of electrons? Pleaz answer me….
Electric current is the flow of charges. (Measured as the rate of flow of charges).
In conductors electric current is caused by the flow of free electrons. When a potential difference is applied across a conductor, the electrons are accelerated towards the positive potential. (But, due to the presence of plenty of electrons, they cannot move with acceleration as they collide with each other during their motion.) There is a net drift of electrons across any cross section and a current is developed.
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How can an alternating current change its direction while moving in a wire or any conductor? Why direct currents aren’t used in Home circuits? RAHUL ASKED Answer: Alternating current is produced by rotating a coil in a strong magnetic field (or ...
Categories: alternating currents, Ask Physics, direct currents, energy loss, Project Tags: answer, aren, Auto, Circuits, conductor, direct currents, direction, Draft, home, magnet, magnetic field, Physics, wire
What ere Eddy currents and what is their application? Rahul asked Answer: Eddy currents (also called Foucault currents) are currents induced in conductors, when the magnetic flux linked with a solid conductor changes. The change in magnetic flux can ...
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“How do we know the direction of magnetic field around the current carrying conductor?” Asked Nikhil Incoming search terms:direction of magnetic field around a current carrying conductorDIRECTION OF MAGNETIC FIELD IN CURRENT CARRYING CONDUCTORmagne...
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what’s effect of coulombic forces on conductor medium ? amk niazi Ans: In a conductor, the coulombian repulsive forces pushes the valence electrons and the electrons move away from the center to the surface ie from the region of stronger force to the region of lesser force, creating a Faraday cage Incoming search terms:what’s effect of coulombic forces on conductor [...]