CHAPTER-1, ELECTROSTATICS 1. A tin nucleus has charge + 50 e. If the proton is at a distance 10-12 m from the nucleus then the potential V at this position is (charge on proton = 1.6 x 10^{-19} C) 14.4 x 104 volts 7.2 x 104 volts 7.2 x 108 volts 14.4 x 108 volts 2. The work done in moving an alpha particle between two points having potential difference 25 volt is 8 x 10^{-18} J 8 x 10^{-19} J 8 x 10^{-20} J 8 x 10^{-16} J 3. The electric potential at the surface of an atomic nucleus (Z= 50) of radius 9.0 x 10^{-15} m is 9 x 10^{5} V 9 V 8 x 10^{6} V 80 V 4. Electric potential on the axis of dipole and at a distance r from it is proportional to 1/r 1/r^{2} 1/r^{3} 0 5. The electrostatic potential energy of a charge of 5 C at a point in the electrostatic field is 50 J. The potential at that point is 0.1 V 5 V 10 V 250 V 6. Work done in moving a unit positive charge through a distance of x meter on an equipotential surface is x joule 1/x joule zero x^{2} joule 7. A copper sphere of diameter 1 m carries a charge of 200 RC. A test charge of 21.1C is taken from a point P to a point Q on the opposite sides of the sphere. Both points are at a distance of 1 m from the centre of the sphere. What is the work done ? 3.6 J 1.85 J 0.93 J Zero 8. The volt is equal to C/q N/m^{2} joule/ coulomb Nm^{2} / C 9. The potential of a spherical conductor of radius 3 m is 6 V. The potential at its centre is zero 2 V 6 V 18 V 10. The potential energy of a charged parallel plate capacitor is U_{0. If a slab of dielectric constant k is inserted between the plates, then the new potential energy will be} U_{0 / k} U_{0 k2} U_{0 /k2} none of these Loading … Question 1 of 10