PHY102

1. 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

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

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

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

5.  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?

6.  Which of the following is a conductor

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

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

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

10.  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?

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

12. 1eV is the energy acquired by an electron in falling freely through --------------------------- 1volt.

13. A negative charge ---------------------------negative charge

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

15.  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

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

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

18. A body that absorbs all radiations falling on it is known as ---------------------------.

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

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

21.  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.

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

23.  An electron enters a uniform magnetic field 0.20 T at an angle of $30^{o}$ the field. Determine the pitch of the helical path assuming its speed is $3times10^{7}$ m/s

24.  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?

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

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

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

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

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

30. 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?

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

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

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

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

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

36. Property of magnetic material in which --------------------------- attracts or repels.

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

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

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

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

41. Neutral objects constitute of equal ---------------------------

42. Whose law is employed in electrostatics ­­?

43.  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?

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

45.  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}

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

47. A proton is accelerated through a potential difference of 100V and the enters a region in which it is moving perpendicular to a magnetic field of flux density 0.20 T. Find the radius of the circular path in which it will travel.

48. <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.

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

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