PHY102

1.  In the space surrounding a wire carrying a steady current, there exists ________

2. The minimum energy required to liberate an electron from a metal surface is called ---------------------------.

3.  A rectangular coil of dimensions 20 cm by 15 cm lies with its plane parallel to a magnetic field of $ 0.5 W/$m^{2}$. The coil, carrying a current of 10 A experiences a torque of 4.5 Nm in the field. How many loops has the coil?

4. Neutral objects constitute of equal ---------------------------

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

6. 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?

7.  A series circuit consisting of an uncharged $42mu$F capacitor and $10 MOmegaega$ resistor is connected to 100V power source. What are the current in the circuit and the charge on the capacitor after one time constant?

8. 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.

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

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

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

12.  Which of the following is not true about the electric field intensity $vec{E}$ of a uniformly charged solid sphere?

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

14. 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?

15. The magnitude and direction of the earth's field varies with position over the --------------------------- surface.

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

17.  The work function of a metal is 3.45eV. Calculate th maximum wavelength of a photon that can eject photo-electrons from the metal

18. As charge increases, electric flux density ­---------------------------

19. 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?

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

21.  A spectral line is emitted when an atom undergoes transition between two levels with a difference in energy of 2.4eV. What is the wavelength of the line?

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

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

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

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?

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

27.  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 $Q_{2}$

28.  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?

29.  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.

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

31. 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?

32. 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}

33.  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

34. 1eV is the energy acquired by an electron in falling freely through --------------------------- 1volt.

35. The force that is responsible for holding electrons to nuclei to form atoms is called the --------------------------- force

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

37. For capacitors connected in series each has the same ____________.

38. Electric charge between two bodies can be produced by ---------------------------

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

40. A positive ion passes through an electric and magnetic fields which are mutually perpendicular. The electric field strength is 20.0kV/m while the magnetic flux density is 0.40T. At what speed will the ion pass through undeflected?

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

42.  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?

43. The energy stored in a system of charges is known as electrostatic potential ---------------------------

44. <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.

45. When amber is rubbed with fur

46.  The term 'lost volts' refers to -----------

47. A negative charge ---------------------------negative charge

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

49. The half-life of a certain radioactive isotope is 32 hours. What fraction of the sample would remain after 16 hours?

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