# PHY102

## Category:PHY102

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ATTENTION:

Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.

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PHY102

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1.  Find the current in through the $0.3Omega$ in the circuit shown

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2. The principle that electric forces add vectorially is known as the principle of ---------------------------

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3. Potential difference is the work done in moving a unit charge ____ from one point to another in an electric field.

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4. For capacitors in parallel, the potential difference across each capacitor is ---------------------------

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5. Field lines are drawn such that the lines per unit cross-section area is proportional to ---------------------------field.

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6. The following are true about electric field lines except that they ______

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7. The resistivity of a semiconductor decreases rapidly with increasing ---------------------------.

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8. Which of the following is not true of an electrostatic force?

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9.  The magnetic flux through each loop of a 35-loop coil is given by $(3.6t-0.71t^{3})times10^{-2}Tm^{2}$, where the time is in seconds. Determine the induced emf at t=5.0s.

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10. The direction of the electric field is opposite to that of the force if the charge is ---------------------------

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11.  From Gauss’ law which of the following is NOT correct?

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12.  A potentiometer wire of length 100cm has a resistance of 10$Omega$. It is connected in series to to a resistance R and a cell of emf 2V and negligible internal resistance. A source of emf of 10mV is balanced by a length of 40cm of the potentiometer wire. What is the value of the resistance R?

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13. At the _______ a dipping compass needle is horizontal and at the magnetic poles it is vertical.

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14. A tiny ball of mass 0.60 g is suspended from a rigid support with a piece of thread in a horizontal electric field of intensity 700 N/C. The ball is in equilibrium when the thread is inclined at an angle of 20_{o} to the vertical. What are the magnitude and sign of the charge on the ball? Take g = 9.8m/s^{2}

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15.  If the steady current in a wire is coming directly toward you, the magnetic field lines

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16. The surface integral of the electric field E over a surface is defined to be electric ---------------------------

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17.  Which of the following can be used to charge a metal rod that si held in your hand? Rub it with ______

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18.  Two identical balls balls P and Q, each of mass 0.20 g, carry identical charges and are suspended by two threads of equal length. The balls position themselves at equilibrium such that the angle between the threads is 60_{o}.If the distance between the the balls is 0.5m, find the charge on each of them. Take g = 9.8 m/s^{2}

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19. The --------------------------- number is the total number of neutrons and protons.

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20.  What are the dimensions of the constant k in Coulomb’s law of electrostatics?

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21. The --------------------------- is the SI Unit of electric charge

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22. The work done in taking a unit positive charge from one point to another in electric field is --------------------------- of the path chosen between the two points.

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23.  A conductor 2cm long carrying a current of 8A lies at right angles to a magnetic field of which the flux density is 1.0T. Calculate the force exerted on the conductor

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24. An RLC circiut contains an ac voltage source with rms value of 50V and has a frequency of 600Hz. Suppose that a resistance R = 20 $Omega$, capacitance C = 10.0 $mu$F and an inductance L = 4.0mH are connected in series to the source. Find the current in the circuit and the voltmeter reading across the inductor.

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25. Charges of ${+}2$ C and ${-2}$ C are situated at points P and Q respectively which are at a distance apart. A point X is mid-way between P and Q. Which of the following correctly describes the electric field and the electric potential at point X?

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26. What is the self - inductance of an air-core solenoid, 1m long and 0.05m in diameter, if it has 1400 turns?

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27.  An electric field of 50 kV/m is perpendicular to a magnetic field 0.25 T. What is the velocity of a charge whose initial of motion is perpendicular to both fields and which passes through the fields undeflected?

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28.  Which of the following is a conductor

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29. For how long must a steady current of 2A flow through a copper voltameter to deposit $10^{-3}$kg of copper? Z for coper is 0.000329g/C

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30. In the cathode ray oscilloscope, when fast moving electrons strike the glass screen coated with zinc and sulphide they cause ---------------------------.

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31. The magnetic North is found by suspending a bar magnet freely on the --------------------------- axis.

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32.  An ac circuit consists of a voltage source $v = 200sin120pi{t}$ and a $6mu$F capacitor in series. Calculate the current established in the circuit

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33.  Kirchhof's loop rule is statement of conservation of __________

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34. When beta decay occurs --------------------------- changes into a proton and electron.

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35. The variation of the compass from the north-south direction is called the ---------------------------

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36. Find the force on a charge 2C in a field 1Vm<sup>-1</sup>---------------------------

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37.  A magnetic field does not exert a force on a _________

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38. Kirchhof's junction rule is statement of conservation of -----------

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39. When a dielectric material is inserted between the plates of a capacitor it increases its ---------------------------

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40. <p style="text-align:left">Six equal point charges Q = 10nC are located at 2,3, 4,5,6,7m. Find the potential at origin.

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41. Gauss's law applies to any hypothetical closed surface called --------------------------- surface.

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42. A uniform electric field of 200 N/C is in the x-direction. A point charge of 3mu{C} is released from rest at the origin. What is the kinetic energy of the charge when it is at x = 4 m?

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43.  1 volt is equal to ________

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44. According to ohm's law the potential difference is proportional to the ---------------------------

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45. An alpha particle is a --------------------------- nucleus consisting of 2 protons and 2 neutrons.

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46. Whose law is employed in electrostatics ­­?

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47. Calculate the electric field at distance of 320 cm from an infinitely long wire carrying a charge per unit length 8.3 C/m.

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48. In the method of charging by friction, The algebraic sum of the individual charges that is the net charge is ---------------------------.

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49. Three point charges $$2mu{C}, {-}4mu{C}$$, and $$6mu{C}$$ are held at the corners of an equilateral triangle with sides equal to 3 cm.What is the resultant force in newtons on the $$2mu{C}$$ charge?

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50. 1eV is the energy acquired by an electron in falling freely through --------------------------- 1volt.

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