PHY102

1. Electric field is measured in Newton per ---------------------------.

2. An RLC circuit is used to tune a radio set to receive NOUN RADIO broadcasting at 105.9MHz in the FM band. The resistance and the inductance of the circuit of the radio set are $12Omega$ and 1.4$mu$H respectively. What capacitance should the circuit have?

3. A positively charged object repels

4. A negative charge ---------------------------negative charge

5.  A single turn coil of cross-sectional area $7.2cm^2$ is in the a magnetic field of flux desity 0.45T. The field which is perpendicular to the coil, is steadily reduced to 0.0T in 5s. Calculate the induced emf.

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

7. When an atom is in the ground state it is said to be ---------------------------

8. The potential difference between two points B and A is equal to the --------------------------- in taking a unit positive charge from A to B.

9. The magnitude of the forces between charged spheres was first investigated by Charles ---------------------------

10. Electric flux density is a function of ---------------------------

11. <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.

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

13. When a charge density depends only on the perpendicular distance from a plane, the charge distribution is said to have--------------------------- symmetry.

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

15.  Two charges $Q_{1} = 500mu{C}$ and $Q_{2} = 100mu{C}$ are located on the XY plane at the positions $r_{1} = 3vec{j} m and r_{2} = 4vec{i}$ m. Find the force exerted on the $Q_{2}$

16. 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?

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

18.  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?

19. Whose law is employed in electrostatics ­­?

20. A galvanometer of resistance $120Omega$ a full scale deflection with a current of 0.0005A. How would you convert it to an ammeter that reads a maximum current of 5A?

21.  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?

22.  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

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

24. When a copper surface is illuminated by radiation of wavelength 2537 angstrome units the value of the stopping potential is found to be 0.24volts. Calculate the work function of copper.

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

26. A charge distribution in which the charge density at any point depends only on the distance of the point from a central point and not on the direction is said to be spherically ---------------------------

27. The force between electric charges is known as ---------------------------

28.  Which of the following is a conductor

29.  A huge spark due to electric discharge in the atmosphere produces all of the following except ______

30. 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.

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

32.  The electric potential difference between two points A and B is 42 V. What is the work done by an external agent in carrying a charge of 5.0$times 10^{-5}$ C from A to B at constant speed?

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

34.  An ammeter is suspected of giving inaccurate readings. In order to confirm the readings, the ammeter is connected to a silver votltameter in series and a steady current is passed for one hour. The ammeter reads 0.56A and 2.0124g of silver is deposited. What is the error is the ammeter reading?

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

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

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

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

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

40. 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?

41. The study of static charges is called ---------------------------

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

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

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

45.  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.

46. The electric flux is a --------------------------- quantity.

47.  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}

48. Find the force on a charge 2C in a field 1Vm^-1---------------------------

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

50. A voltmeter connected across a 60Hz ac source reads 240V. Write down the expression of the instanteneous voltage as a function of time.