# Tamil Nadu +2 Physics - Electrostatics - Set 3

Set 3 questions on Electrostatics is provided below:-

31) All the following listed below are insulators except

a) Glass
b) Ebonite
c) Plastic
d) Earth

32) The force between two charged bodies was studied by Coulomb  in the year -----

a) 1785
b) 1975
c) 1875
d) 1685

33) If q1 and q2 are two point charges separated by distance r, then force between these charges is defined by

a) F = q1 * q2 / r^2
b) F = k * q1 * q2 / r^3
c) F = k * q1 * q2 / r^2
d) F = k * q1 * q2 * r ^2

34) The unit of εo is

a) C^2 N^-1 M^-2
b) C^2 N^-1 m^-2
c) C^-2 N^-1 M^-2
d) C^2 N^-1 M^3

35) The value of k in vacuum is ------------

36) The value of permittivity of free space is -------------

37) The force between two point charges depends on the ----------in which the two charges are situated.

38) Relative permittivity is also know as ------

a) Absolute permittivity
b) Dielectric constant
c) Coulumb Law
d) Nearest permittivity

39) The dielectric constant of air is ---------

40) Forces exerted by charges on each other are equal in -------- and opposite in ----------.

a) Magnitude,direction
b) direction, magnitude
c) Magnitude, velocity
d) direction, velocity

41) The unit of electric field strength is

a) N * C
b) N^-1 * C^-1
c) N * C^-1
d) N ^-1 * C

42) Electric field strength is also know as -----------

43) Force exerted by an electric field on a charge is F =

44) The concept of Field lines was introduced by

a) Coulomb
b) Thales
c) Benjamin Franklin