Ch 1. Electric Charges And Fields Flashcards
The ratio of electric force and gravitational force acting between two charges is in the order of
10⁴²
A charge ‘q’ placed at the centre on the line joining two charges ‘Q’ will be in equilibrium if ‘q’ will be equal to
-Q/4
What is the angle between the electric dipole moment p and the electric field strength E when the dipole is in a stable equilibrium
0 Degrees
Which of the following physical quantities is a vector?
Electric intensity
The law, governing the force acting between two electric charges known as
Coulomb’s Law
S.I unit of permittivity is
Farad per meter (F/m)
(C²N⁻¹m⁻²)
The total electric flux coming out from stationary unit positive charge in air is
ε₀⁻¹
The symbol ε₀ represents the permittivity of free space. It’s a constant used in electromagnetism and its value is approximately 8.85 x 10^-12 Farad per meter (F/m). The symbol “⁻¹” denotes the inverse or reciprocal of a quantity. So, ε₀⁻¹ means the reciprocal of the permittivity of free space
The force, acting on per unit charge is called
Electric field
Quantization of charge indicates that
Charge, which is a fraction of charge on an electron, is not possible
Electric field lines provide information about
Field strength, direction and nature of charge
The value of 1/4πε₀ is
9 × 10⁹ Nm² c⁻²
Which of the following relation is correct
E= F/q
Arrow sign on E and F
SI unit of electric dipole moment is
The SI unit for electric dipole moment is the coulomb-meter (C⋅m)
The relative permittivity (εr) of a medium is
Neeche r
ε/ε₀
Surface density of a charge is equal to
Total Charge/Total Area
The dielectric constant of water is
80
The value of force acting on a charged particle in electric field is
qE
Which of the following values of n is not possible in relation Q = ne?
4.2
The value of ε, in air is
1
Dimension of charge is
AT
Which of the following has unit volt/metre?
Electric Field
Unit of ε₀ is
Fm⁻¹
Unit of surface charge density is
Coulomb/metre²
In the figure, if net force on Q is zero then the value of Q/q is
2√2
When a body is charged, it’s mass —
May increases or decreases
The torque acting on electric dipole of dipole moment P placed in electric field of intensity E is
p × E
The electric dipole moment of an electric dipole made up of two opposite charge having magnitude +3.2 × 10⁻¹⁹C and -3.2 × 10⁻¹⁹C separated by a distance 2.4 × 10⁻¹⁰ m is
7.68 × 10⁻²⁹ C-m
The intensity of electric field at any point on the surface of a charged conductor is
Perpendicular to the surface
Permittivity of the free space is
8.85 × 10⁻¹² Fm⁻¹
What is the SI unit of electric dipole moment?
Coulomb- metre
The SI unit of electric field E is
NC⁻¹
1 stat-coulomb = ……… Coulomb
1/3 × 10⁻⁹
1 coulomb charge = …… e.s.u
3 × 10⁹
The specific charge of electron is
1.8 × 10¹¹ C/kg
Electrostatic field is
Conservative
Which is scalar quantity?
Charge, Capacitance and Potential
Intensity of electric field at a point is
E = F/q
Surface density of charge is
σ = Q/A or σ = dq/dA
The vector form of Coulomb’s law is
Which of the following is correct for charge on an electron?
e = 1.602 × 10⁻¹⁹ C
The SI unit of electric intensity is
Newton per Coulomb (N/C) Or Volt per meter (V/m).
S.I unit of electric flux is
Volt-metre
If + q charge is placed inside any spherical surface then total flux coming out from whole surface will be
q/ε₀
The electric field at a point near an infinite thin sheet of charged conductor is
E = σ/2ε₀
The electrical intensity inside a charged holllow sphere is
Zero
The electric flux over the surface of a sphere if it is charged with 10µC is
36π × 10⁴ Nm²/C
