Let \(ε_0\) denote the dimensional formula of the permittivity of vacuum. If M=mass, L=length, T=time and
I=electric current, then
(A) [M⁻¹L⁻³T²I]
(B) [M⁻¹L⁻³T⁴I²]
(C) [M⁻¹L²T⁻¹I⁻²]
(D) [M⁻¹L²T⁻¹I]
A negatively charged oil drop is prevented from falling under gravity by applying a vertical electric field 100 V/m. If the mass of the drop is 1.6 x \(10^{-3}\)g, the number of electrons carried by the drop is (g=10m/\(s^2\))
(A)\(10^{18}\)
(B)\(10^{15}\)
(C)\(10^{12}\)
(D)\(10^9\)
Charge in motion within the Gaussian surface gives changing physical quantity
(A) Electric field
(B) Electric flux
(C) Charge
(D) Gaussian surface area
There is a point charge q located at the center of a cube. What is the electric flux of this point charge, through a face of the cube?
(A)q/ε₀
(B) q/6ε₀
(C) q/3ε₀
(D)It will depend upon the size of the cube
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
(A) Increase four times
(B) be reduced to half
(C) remain the same
(D) Be doubled
Law stating that, force is directly proportional to product of charges and inversely proportional to square of separation between them, is
(A) Newton’s law
(B) Coulomb’s law
(C) Gauss’s law
(D) Ohm’s law
When a body charges by conduction, its mass
(A) Remains same
(B) Increases
(C)Decreases
(D)Increase or decrease
Electric charge between two bodies can be produced by
(A )Sticking
(B) Rubbing
(C) Oiling
(D) Passing AC current
The insulation property of air, breaks down at E=3x \(10^6\)V/m. The maximum charge that can be given to a sphere of radius 2.5 m is approximately
(A) 2x \(10^{-2}\)C
(B) 2x \(10^{-3}\)C
(C) 3x \(10^{-6}\)C
(D) 3x \(10^{-5}\)C
A point charge +Q is placed in the vicinity of a conducting surface. Draw the electric field lines between the surface and the charge.
Why do the electrostatic field lines not form closed loops ?
Why do the electric field lines never cross each other ?
Figure shows a point charge + Q, located at a distance R/2 from the centre of a spherical metal shell. Draw the electric field lines for the given system.
Why should electrostatic field be zero inside a conductor ?
What is the value of the angle between the vectors and for which the potential energy of an electric dipole of dipole moment , kept in an external electric field , has the maximum value.