Electrostatics MCQ Questions Answers – Electrical Engineering
Electrostatics is a fascinating branch of physics that deals with the study of electric charges and their interactions. It forms the foundation for understanding various electrical phenomena and has numerous applications in our daily lives, from electronics to power generation. To delve into the world of electrostatics, let’s explore some multiple-choice questions (MCQs) and their corresponding answers that will help solidify your grasp of this intriguing subject.
1) The relative permittivity of air is
a) 0
b) 1
c) 8.854 x 10-12
d) no one of the above
2) An electric field can deflect
a) x-rays
b) neutrons
c) a-particles
d) y-rays
3) The relative permittivity of most material lies between
a) 20 and 100
b) 10 and 20
c) 100 and 200
d) 1 and 10
4) Electric lines of force enter or leave a charged surface at an angle
a) of 900
b) of 300
c) of 600
d) depending upon surface conditions
5) The ratio of force between two small spheres with constant charge in air and in a medium of relative of relative permittivity K is
a) K2 : 1
b) 1 : K
c) 1 : K2
d) K : 1
6) For a dipole, electric field varies as
a) r-2
b) r-3
c) r-1
d) r-4
7) Out of the materials given below, which has the highest dielectric strength?
a) glass
b) mica
c) oiled paper
d) air
8) The electric potential at the surface of an atom nucleus (Z=50) of radius 9.0 x 10-15 m is
a) 40 V
b) 8 x 106 V
c) 9 V
d) 120 V
9) The relative permittivity of an insulator cannot be
a) 20
b) 33
c) 6
d) infinity
10) The dielectric used in high voltage trans formers is
a) mica
b) paraffin
c) porcelain
d) oiled paper