PHY102

1.  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?

2. 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.

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

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

5. 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.

6.  Which of the following is a conductor

7.  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?

8.  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?

9. When amber is rubbed with fur

10. 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?

11.  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.

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

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

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

15.  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

16.  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

17. A region where an electric charge experiences a force is ---------------------------field

18. 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.

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

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

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

22. Gaussian surface is an imaginary closed ---------------------------

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

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

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

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

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

28.  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?

29. A negative charge ---------------------------negative charge

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

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

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

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

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

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

36. 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 ---------------------------

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

38.  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.

39. 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?

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

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

43. Neutral objects constitute of equal ---------------------------

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

45. According to Faraday's law, the magnitude of the induced e.m.f is proportional to the rate of change of --------------------------- linking the circuit.

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

47. 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?

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

49. A positively charged object repels

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