pmp exam questions and answers

5$\times3=15$ marks 30. a) Differentiate log x w.r.t. $\mathrm{x}$ from first principles 3 marks b$)$ If $\sqrt{\mathrm{x}}+\sqrt{\mathrm{y}}=3$, find${\displaystyle \frac{\mathrm{d}\math..

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;">(i) The net charge inside the surface is zero. (ii) The electric field is zero everywhere. (iii) There are no charges inside the surface. Ans. The statement, (i) is true. The statement (iii) need not be true because Gauss's law says that the net flux through any closed surface equals the net charge inside the surface divided by eo. A dipole who..

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1. Three identical coils A, B and C are placed with their planes parallel to one another. Coils A and C carry current as shown in Fig. 15.34. Coils B and C are fixed. The coil A is moved towards B with uniform speed. Is there any induced current..

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;">You are given three condensers of value 2\lF, 3 flF and 6 \iF. How would you connect them so that the resultant capacity is equal to 4 pF? Ans. First connect 3 (i. and 6 (iF in series. The effective capacitance of the combination is Cs = ^ X f = 2 jxF. Now connect this combination to 2 |a.F in parallel. The resultant capacity will be 3 + 6 2 + ..

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. [See Fig 9.17] The thermo e.m.f. E = a0 + j 00 2 dE The thermoelectric power S = = a + P0. do The intercept of the thermoelectric line (say BC) with the y-axis gives the const a. i.e., OB = a. The slope of the line gives p. 16. What is the meant by specific heat of electricity? Ans. The Thomson coefficient a is called the specific heat of electr..

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. What are the points at which the resultant field is parallel to the line joining the two charges? [E.Q.] Ans. The resultant field is parallel to the line joining the two charges at any point on the line joining the charges and also at any point on the perpendicular bisector of the line joining the two charges. 8. Fig. 3.55 (a) and (b) show the f..

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. So the wire will not experience any force. But outside the pipe there is a definite value for the magnetic field. So the wire will experience a force. 7. Two parallel wires carrying current attract each other but two electrons beams moving in the same direction repel each other. Why ? Ans. In the case of two wires carrying current they attract e..

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;">produces a large increase in current (A i). This impedance is called zener impedance Z z and u -7 AV is given by Z z = A i 6. What is meant by the temperature coefficient of zener diode ? Ans. The temperature coefficient of zener diode is the percent change in zener voltage per degree Celsius. 7. In the Fig...

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%2012.htm#bookmark50">4 x-J-y-i N = 10" 7 N Unit pole is that pole which when placed in vaccum at a distance of 1 m from an equal and similar pole repels with a force of 10" 7 N. 3. A magnet of pole strength m and length 21 is cut in three different ways. Find the magnetic moment of the shaded portion in each case [See Fig. 12.221. Ans. Fig. (a). ..

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