# Gs Paper

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Guess Paper – 2011
Class – XII
Subject –Physics

Time-3 hr. Date- 10/02/11 Marks-70

General Instructions: i) All questions are compulsory. ii) There are 30 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 18 carry two marks each, questions 19 to 27 carry three marks each and questions 28 to 30 carry five marks each. iii) There is no overall choice. However ,an internal choice has been provided in one question of two marks, one question of three marks and all three questions of five marks each. You have to attempt only one of the choices in such questions. iv) Use of calculators is not permitted. v) You may use the following values of physical constants wherever necessary :

c = 3 x 108 ms-1 h = 6.626 x 10-34 Js e = 1.602 x 10-19 C µ0= 4π x 10-7 TmA-1

1 = 9 x 109 Nm2C-2 4πε0 Mass of electron me = 9.1 x 10-31 kg Mass of neutron mn = 1.675 x 10-27 kg Boltzmann’s constant k =1.381 x 10-23 JK-1 Avogadro’s number NA = 6.022 x 1023 mol-1 Radius of earth = 6400 km

UNITS- 1. ELECTROSTATICS 2.CURRENT ELECTRICITY 3.MAGNETIC EFFECT OF CURRENT AND MAGNETISM 4. EMI & AC 5. EM Waves.

Q.1 How is the relative permeability (µr) of a material related to its susceptibility (χm) ? 1
Q.2 A metallic wire 1 m in length is moving normally across a field of 0.1 T with a speed of 5 ms-1. Find the emf between the ends of the wire. 1
Q.3 What is the angle between the directions of electric field at any (i) axial point and (ii) equatorial point due to an electric dipole ? 1
Q.4 A(hypothetical) bar magnet (AB) is cut into two equal parts. One part is now kept over the other, so that pole C2 is above C1. If M is the magnetic moment of the original magnet, what would be the magnetic moment of the combination so formed ? 1 | C1 | C2

| |

Q.5 The graph shown here, shows the

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