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KENDRIYA VIDYALAYA SANGATHAN LUCKNOW REGION SECTOR . J . ALIGANJ LUCKNOW STUDY MATERIAL XII PHYSICS 2010 2011 PATRON Shri Ranvir SinghAssistant Commissioner(Officiating) KVS(LR)DIRECTOR Shri S.K.TrivediPrincipal K.V. IIT Kanpur RESOURCE PERSONS1. Mr.S.K.DixitK.V.I.I.T. Kanpur2. Mr.A.K.DwivediK.V.I.I.T. Kanpur3. Mr.Anil YadavK.V.I.I.T. Kanpur4. Mr. R. C. PandeyK.V.Cantt Kanpur5. Mr.Neeraj Asthana K.V.No.2 Armapur Kanpur UNIT 1 ELECTROSTATICSVERY SHORT ANSWERS QUESTIONS (1 MARKS)Q1- The force acting between two point charges q1 and q2 are kept at some distance apart in air is attractive or repulsive when (1) q 1q 2>0 (2) q 1q 2<0Ans-(1) Repulsive (2) AttractiveQ2- The electric field lines never cross each other, why?Q3- Name four basic Properties of electric charge.Q4- What is the angle b/w the directions of electric field at any 1. Axial point 2. Equatorial point due to an electric diapole(Hint:- 180)Q5- Draw an equipotential surface in a uniform electric field.Q6-What should be the work done if a point charges +q is taken from a point A to the point B on the circumference drawn with another point +q at the centre? Q7-What is an equipotential surface? Can two such surfaces intersect?Q8- Name the dielectric whose molecules have (i) non-zero and (ii) zero dipole moment.

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