The electric flux through a closed gaussian surface depends upon
(A) Permittivity of the medium.
(B) Net charge enclosed only.
(C) Net charge enclosed and permittivity of the medium.
(D) Net charge enclosed, shape and size of the Gaussian surface and permittivity of the medium.
(A) Permittivity of the medium.
(B) Net charge enclosed only.
(C) Net charge enclosed and permittivity of the medium.
(D) Net charge enclosed, shape and size of the Gaussian surface and permittivity of the medium.
(C) Net charge enclosed and permittivity of the medium
Charge in motion within the Gaussian surface gives changing physical quantity
(A) Electric field
(B) Electric flux
(C) Charge
(D) Gaussian surface area
(i) Derive the expression for electric field at a point on the equatorial line of an electric dipole.
(ii) Depict the orientation of the dipole in (i) stable, (ii) unstable equilibrium in a uniform electric field.
An electric dipole is placed in a uniform electric field.
(i) Show that no translatory force acts on it.
(ii) Derive an expression for the torque acting on it.
(iii) Find work done in rotating the dipole through 180°.
When a soap bubble is given an electric charge
(A) It contracts
(B) It expands
(C) Its size remains the same
(D) It expands or contracts depending upon whether the charge is positive or negative
An electric dipole is held in a uniform electric field.
(i) Show that the net force acting on it is zero.
(ii) The dipole is aligned parallel to the field. Find the work done in rotating it through the angle of 180°.
The force between two charges, when placed in free space, is 5N. if they are in a medium of relative permittivity 5, the force between them will be
A. 1N
B. 25N
C. 2.5N
D. 1/5N
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
In an interference experiment, the spacing between successive maxima and minima is
(A) λd / D
(B) λD / d
(C) dD / λ
(D) λd / 4D
In the figure the net electric flux through the area... when the system is in air. On immersing the system in water,the net electric flux through the area
Angular width of interference fringe depends on
(A) Distance Between Slit and Screen
(B) Ratio of the wavelength and Slit width
(C) Wavelength of light
(D) Width of Slit
The parameter of light wave which remain same after refraction
(A) speed
(B) frequency
(C) wavelength
(D) none of these
A wire of resistance 0.5 Ωm⁻¹ is bent into a circle of radius 1m. The same wire is connected across a diameter AB as shown in the fig. The equivalent resistance is
(a) Π ohm
(b) Π (Π + 2) ohm
(c) Π/( Π + 4) ohm
(d) (Π + 1) ohm
Cathode rays travelling from west to east enter into region of electric field directed towards south to north in the plane of paper. The deflection of cathode rays is towards:
(A) East
(B) West
(C) North
(D) South
Wavefront is the locus of all points, where the particles of the medium vibrate with the same
(a) phase.
(b) amplitude.
(c) frequency.
(d) period.