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Physics Objectives > Ch 1. Electric Charges And Fields > Flashcards

Ch 1. Electric Charges And Fields Flashcards

1
Q

The ratio of electric force and gravitational force acting between two charges is in the order of

A

10⁴²

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2
Q

A charge ‘q’ placed at the centre on the line joining two charges ‘Q’ will be in equilibrium if ‘q’ will be equal to

A

-Q/4

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3
Q

What is the angle between the electric dipole moment p and the electric field strength E when the dipole is in a stable equilibrium

A

0 Degrees

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4
Q

Which of the following physical quantities is a vector?

A

Electric intensity

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5
Q

The law, governing the force acting between two electric charges known as

A

Coulomb’s Law

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6
Q

S.I unit of permittivity is

A

Farad per meter (F/m)

(C²N⁻¹m⁻²)

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7
Q

The total electric flux coming out from stationary unit positive charge in air is

A

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

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8
Q

The force, acting on per unit charge is called

A

Electric field

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9
Q

Quantization of charge indicates that

A

Charge, which is a fraction of charge on an electron, is not possible

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10
Q

Electric field lines provide information about

A

Field strength, direction and nature of charge

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11
Q

The value of 1/4πε₀ is

A

9 × 10⁹ Nm² c⁻²

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12
Q

Which of the following relation is correct

A

E= F/q

Arrow sign on E and F

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13
Q

SI unit of electric dipole moment is

A

The SI unit for electric dipole moment is the coulomb-meter (C⋅m)

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14
Q

The relative permittivity (εr) of a medium is

Neeche r

A

ε/ε₀

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15
Q

Surface density of a charge is equal to

A

Total Charge/Total Area

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16
Q

The dielectric constant of water is

A

80

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17
Q

The value of force acting on a charged particle in electric field is

A

qE

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18
Q

Which of the following values of n is not possible in relation Q = ne?

A

4.2

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19
Q

The value of ε, in air is

A

1

20
Q

Dimension of charge is

A

AT

21
Q

Which of the following has unit volt/metre?

A

Electric Field

22
Q

Unit of ε₀ is

A

Fm⁻¹

23
Q

Unit of surface charge density is

A

Coulomb/metre²

24
Q

In the figure, if net force on Q is zero then the value of Q/q is

A

2√2

25
Q

When a body is charged, it’s mass —

A

May increases or decreases

26
Q

The torque acting on electric dipole of dipole moment P placed in electric field of intensity E is

A

p × E

27
Q

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

A

7.68 × 10⁻²⁹ C-m

28
Q

The intensity of electric field at any point on the surface of a charged conductor is

A

Perpendicular to the surface

29
Q

Permittivity of the free space is

A

8.85 × 10⁻¹² Fm⁻¹

30
Q

What is the SI unit of electric dipole moment?

A

Coulomb- metre

31
Q

The SI unit of electric field E is

A

NC⁻¹

32
Q

1 stat-coulomb = ……… Coulomb

A

1/3 × 10⁻⁹

33
Q

1 coulomb charge = …… e.s.u

A

3 × 10⁹

34
Q

The specific charge of electron is

A

1.8 × 10¹¹ C/kg

35
Q

Electrostatic field is

A

Conservative

36
Q

Which is scalar quantity?

A

Charge, Capacitance and Potential

37
Q

Intensity of electric field at a point is

A

E = F/q

38
Q

Surface density of charge is

A

σ = Q/A or σ = dq/dA

39
Q

The vector form of Coulomb’s law is

A
40
Q

Which of the following is correct for charge on an electron?

A

e = 1.602 × 10⁻¹⁹ C

41
Q

The SI unit of electric intensity is

A

Newton per Coulomb (N/C) Or Volt per meter (V/m).

42
Q

S.I unit of electric flux is

A

Volt-metre

43
Q

If + q charge is placed inside any spherical surface then total flux coming out from whole surface will be

A

q/ε₀

44
Q

The electric field at a point near an infinite thin sheet of charged conductor is

A

E = σ/2ε₀

45
Q

The electrical intensity inside a charged holllow sphere is

A

Zero

46
Q

The electric flux over the surface of a sphere if it is charged with 10µC is

A

36π × 10⁴ Nm²/C

Physics Objectives (16 decks)

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