BOSEM: Social Science Previous year solved questions 2010 to 2016

Unit- I: Electrostatics (8 Marks)2010

1.       What will be the electric charge on the nucleus of the atom ­­₈O¹⁶             ?                                                                                              1
2.       Obtain an expression for the equivalent capacitance of three capacitors of capacitances C₁, C₂ and C₃ connected in series.                3
3.       Define electric field intensity. Derive an expression for the electric field intensity at a point on the equatorial line of an electric dipole.                                                                                                5
Or, Define electric potential at a point in an electric field. Derive an expression for the electric potential at a point due to an electric dipole.  5                                                                                                                                  4.       An electric dipole place at the centre of a sphere. The electric flux passing through the surface of the sphere is                         1

A. Infinity                               B. Zero                   C.                         D.       

20111.       What is the numerical value of charge of a proton?                     1
2.       From the figure given below, compute the equivalent capacitance across AB
               

                                                                                                                                            

3.       Define electric potential. Derive the expression for electric potential of a point charge ‘Q’ in a medium of a point constant ‘K’ at a point ‘P’ whose distance from the charges is ‘X’.                           1+4=5
Or,State Gauss’s law. Using it, derive the expression for electric field outside a uniformity charged spherical shell.                                                                                                                                        1+4=520121.       Define an equipotential surface in electrostatics.                                                                                                                         1
2.       Derive an expression of equivalent capacitance for 2 (two) parallel plate capacitors connected in series.                                                                                                                                                   2
3.       Derive an expression for the energy of a parallel plate capacitor. In what form of field, is the energy of a capacitor stored?                                                                                                                             5
Or,
Find the expression for the electric field sheet with uniform charge density. What is the value of the electric field outside a charged parallel plate capacitor?                                                                                                                                                  4+1=520131.       How do we represent the direction of the electric field at any point on a line of force?                                                                                                                                                                                   1
2.       Calculate the Coulomb force between two alpha particles separated by a distance of 3.2 x 10^-15 m in air, charge on an electron is  -16x10^-19 C.                                                                                                                                                                       2
3.       How polarized dielectrics reduce the external electric field inside it?                                                                                     2
4.       Obtain the expression for the electric potential at any point due to a point charge.                                                                                                                                                                                          3
20141.       What is the principle of superposition of charges?                                                                                                                       1
2.       The electric field at a point due to a point charge is 20 N/C and the electric potential at that point is 10V. What is the distance of the point from the charge?                                                                                                                                           2
3.       Define electric field intensity and electric potential. Derive an expression for the potential energy of an electric dipole in an electrostatic field.                                                                                                                                                                          2+3=5
Or,What are polar dielectric and non-polar dielectric? Derive an expression for the energy stored in a charged capacitor.                                                                                                                                2+3=520151.       State the principle of conservation of charge.                                                                                                                               1
2.       Find the coulomb’s force between a proton and an electron separated by 0.8x10^-15 m in vacuum.                                                                                                                                                                2
3.       Define electric flux and give its SI unit. Derive an expression for field intensity due to an infinitely long uniformly charged wire.                                                                                                                    2+3=5
Or,Define capacitance of a capacitor and write its SI unit. Derive an expression for capacitance of a parallel plate capacitor when air is filled between the two plates.                                                                                                                                      1+4=5