# Physics Test

Jun 17th, 2015
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A. Answer all questions by choosing the correct option A, B, C or D. (i) Three identical point charges, each of Q Coulomb, are kept at the three vertices of an equilateral triangle having each side = a. [See figure 1]. Electro-static potential energy of the system is:

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PHYSICSPaper 1(THEORY)(Three hours)(Candidates are allowed additional 15 minutes for only reading the paper.They must NOT start writing during this time)----------------------------------------------------Answer all questions in Part I and six questions from Part II, choosing two questions from each of the Sections A, B and C.All working, including rough work, should be done on the same sheet as, and adjacent to, the rest of the answer.The intended marks for questions or parts of questions are given in brackets [ ].(Material to be supplied: Log tables including Trigonometric functions)A list of useful physical constants is given at the end of this paper.-----------------------------------------------------------------------PART IAnswer all questionsQuestion 1 [5]A. Answer all questions by choosing the correct option A, B, C or D.(i) Three identical point charges, each of Q Coulomb, are kept at the three vertices of an equilateral triangle having each side = a. [See figure 1]. Electro-static potential energy of the system is:(ii) Four cells E1 , E2 , E3 and E4 are connected as shown in Figure 2. Emf of the battery so formed is:(iii) A 50 non-inductive resistor is connected to a source which generates an emf e which is given bye = 200 Sin (120 t) Volt. Peak value of current flowing through the resistor is:(A) 0.25 A (B) 2.5 A (C) 4.0 A (D) 42 A(iv) A thin converging lens of focal length 25 cm is kept in c

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