### Electrostatics Objectives Part 06

101 . Twenty seven identical drops of mercury are charged simultaneously to the same potential of 10v. Assuming the drops to be spherical, if all the charged drops are made to combine to form one large drop then its potential is 90 units.

102 . Two metal plates each 20cm*20cm are separated by a sheet of plastic (Er=3.0) 3.5mm thick. The capacitance of capacitor so formed will be 2120pf

A 4000uf capacitor of an electronic flash unit is charged to a potential of 300v.

103 . According to above data the charge stored in the capacitor will be 1.2C

104 . According to above data the energy stored in the capacitor will be 180J

105 . An electric field can deflect an Alpha particles.

106 . The effective capacitance between point x and y is 4uf

107 . The combined capacity of the parallel combination of two capacitors is four times their combined capacity when connected in series. It can be concluded that their capacitance are equal

A capacitor to the terminal of which a potential of 300v has been applied, consists of 54 aluminium-foil plates interleaved with sheet of mica (Er=5.0) each 0.1mm thick. The size of each metal plate is 12mm*16mm.

108 . According to above data, the capacitance of the capacitor is 4160pf

109 . According to above data, the potential gradient in the dielectric will be 3KV/mm

10 . According to above data, the charge in the fully charged capacitor will be 1.25*10^-6 C

11 . According to above data, the electric flux density in C/mm will be 0.132510^-3

12 . During dielectric breakdown of a capacitor permanent conduction path is established between plates

13 . In a uniform electric field, field lines and equi-potentials are orthogonal

14 . At the surface of two conducting surfaces tangential components of both electric intensity and current density are continuous

15 . A potential of 200v is applied to a capacitor, the plates of which are 2mm apart. The strength of electric field in kVm is 100

The plate area of a parallel plate, capacitor is 0.3m^2 and the thickness of the paper dielectric is 0.12mm. The relative permittivity of the paper dielectric is 2.5 and its dielectric strength is 3000V/mm.

16 . According to the above data, the capacitance of the capacitor is nearly 0.55uf

17 . According to the above data, the voltage rating of the capacitor is 360v

18 . The positive terminal of a 6v battery is connected to the earth. Then the negative terminal will be at –6v

19 . A hollow insulated conducting sphere is given a positive charge of 10uC. What will be the electric field at the center of the sphere if it reduces in 2m? 0

20 . A tiny particles carrying a charge of 0.3C is accelerated through a PD of 1000V. The kinetic energy acquired by the particle will be 300J