 # PHY102

## Category:PHY102

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PHY102

1 / 50

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?

2 / 50

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 / 50

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?

4 / 50

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 ---------------------------

5 / 50

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

6 / 50

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

7 / 50

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

8 / 50

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?

9 / 50

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

10 / 50

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

11 / 50

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

12 / 50

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

13 / 50

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

14 / 50

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

15 / 50

Whose law is employed in electrostatics ­­?

16 / 50

Gaussian surface is an imaginary closed ---------------------------

17 / 50

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}

18 / 50

A positively charged object repels

19 / 50

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

20 / 50

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?

21 / 50

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 / 50

A magnetic field does not exert a force on a _________

23 / 50

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

24 / 50

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

25 / 50

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

26 / 50

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

27 / 50

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

28 / 50

A negative charge ---------------------------negative charge

29 / 50

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

30 / 50

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?

31 / 50

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

32 / 50

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?

33 / 50

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

34 / 50

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

35 / 50

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

36 / 50

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

37 / 50

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

38 / 50

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

39 / 50

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

40 / 50

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

41 / 50

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

42 / 50

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

43 / 50

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

44 / 50

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

45 / 50

For capacitors connected in series each has the same ____________.

46 / 50

Which of the following is a conductor

47 / 50

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

48 / 50

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.

49 / 50

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?

50 / 50

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?

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