The energy stored in a capacitor of capacitance C having a charge Q under a potential V is
D.
By energy stored in a charged conductor
Suppose, a conductor of capacity C is charged to a potential V and Q the charge on conductor at a instant.
The potential of the conductor
Now, work done in bringing a small charge dQ at this potential is,
∴ Total work done in charging it from O to Q is,
This work is stored as the potential energy,
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
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