The electrostatic force between two point charges is directly proportional to the
sum of the charges
distance between the charges
product of the charges
permittivity of the medium
The time period of revolution of a charge q1 and of mass m moving in a circular path of radius r due to Coulomb force of attraction with another charge q2 at its centre is
A point charge of 2 C experiences a constant force of 1000 N when moved between two points separated by a distance of 2 cm in a uniform electric field. The potential difference between the two points is
12 V
8 V
10 V
16 V
In the network shown below, if potential across XY is 4 V, then the input potential across AB is
16 V
20 V
8 V
12 V
If the ammeter A shows a zero reading in the circuit shown below, the value of resistance R is
500 Ω
125 Ω
100 Ω
41.5 Ω
The apparent flattening of the sun at sunset and sunrise is due to
refraction
diffraction
total internal reflection
interference
The polarising angle for a medium is found to be 60°. The critical angle of the medium is
C.
From Brewster's law
The refractive index of the medium is given by
n = tan ip
where, ip = polarising angle
⇒ n = tan 60°
⇒ n =
If C be the critical angle for the medium, then
Identify the mismatch in the following
Myopia — Concave lens
For rear view — Concave mirror
Hypermetropia — Convex lens
Astigmatism — Cylindrical lens
In Young's double slit experiment, to increase the fringe width
the wavelength of the source is increased
the source is moved towards the slit
the source is moved away from the slit
the slit separation is increased