Quantisation of charge implies:
  • Charge does not exist
  • Charge exists on particles
  • There is a minimum permissible magnitude of charge
  • Charge can't be created
Which one of the following is the unit of electric field?
  • Coulomb
  • Newton
  • Volt
  • N/C
Three charges + 3q + q and Q are placed on a st. line with equal separation. In order to maket the net force on q to be zero, the value of Q will be :
  • +3q
  • +2q
  • -3q
  • -4q
If an electric dipole is kept in a uniform electric field then resultant electric force on it is :
  • always zero
  • never zero
  • depend upon capacity of dipole
  • None
The number of electron-taken out from a body to produce 1 coulomb of charge will be :
  • 6.25 × 1018
  • 625 × 1018
  • 6.023 × 1023
  • None
The work done in rotating an electric dipole in an electric field:
  • W = ME (1 - cos θ)
  • W = ME tan θ
  • W = ME sec θ
  • None
If sphere of bad conductor is given charge then it is distributed on:
  • surface
  • inside the surface
  • only inside the surface
  • None
Electric field in a cavity of metal:
  • depends upon the surroundings
  • depends upon the size of cavity
  • is always zero
  • is not necessarily zero
The dielectric constant of a metal is:
  • 0
  • 1
  • ∞
  • -1
1 coulomb is equal to:
  • 3 × 109 e.s.u.
  • \(\frac{1}{3}\) × 109 e.s.u.
  • 3 × 1010 e.s.u.
  • \(\frac{1}{3}\) × 1010 e.s.u.
Each of the two point charges are doubled and their distance is halved. Force of interaction becomes p times, w here p is :
  • 1
  • 4
  • \(\frac{1}{16}\)
  • 16
Coulomb's law in vector form can be written as \(\vec{F}\) = (\(\frac{1}{4πε_n}\)) (\(\frac{q_1q_2}{r^2}\))\(\vec{r}\) where ε0 is the permitivity of free space. The SI units of ε0 will be:
  • N-1m-2C-2
  • Nm-2C2
  • N-1m-2C9.
  • Nm-2C2
The dimensional representation of cu will be :
  • [MLT4 A2]
  • [M-1L-3T4A2]
  • [ML-2T ]
  • None of these
When placed in a uniform field, a dipole experiences:
  • a net force
  • a torque
  • both a net force and torque
  • neither a net force nor a torque
A parrot comes and sits on a bare high power line. It will:
  • experience a mild shock '
  • experience a strong shock.
  • get killed instantaneously
  • not be affected practically
The SI units of electric dipole moment are:
  • C
  • Cm-1
  • Cm
  • Nm-1
If two conducting sphere are connected after charging separately then:
  • Electrostatic energy sphere energy will remain conserved
  • Electrostatic energy charges remains conserved
  • Electrostatic energy energy and charge remains conserved
  • None
A soap bubble is given a negative charge, then its radius:
  • increases
  • decreases
  • remains unchanged
  • may increase or decrease
In non-uniform electric field, electric dipole experiences:
  • torque only
  • torque as well as net force
  • force only
  • None of these
An electron is sent in an electric field of magnitude 9.1 × 106NC-1. The acceleration produced in it is :
  • 1.6 ms-2
  • 1.6 × 1018ms-2
  • 3.2 × 1018ms-2
  • 0.8 × 1018 ms-2
0 h : 0 m : 1 s

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