Suppose the space between the two inner shells of the previous problum is filled with a dielectric constant .`K.`Find the capacitance of the system between `A and B.`

A spherical capacitor has an inner sphere of radius 12 cm and an outer sphere of radius 13 cm. The outer sphere is earthed and the inner sphere is given a charge of 2.5 µC. The space between the concentric spheres is filled with a liquid of dielectric constant 32. (a) Determine the capacitance of the capacitor. (b) What is the potential of the inner sphere? (c) Compare the capacitance of this capacitor with that of an isolated sphere of radius 12 cm. Explain why the latter is much smaller.

If F is the force between two point charge submerged in a medium of dielectric constant K, then on withdrawing the mediun the force between the charges becomes.......

Assertion : Newton's rings are formed in the reflected system. When the space between the lens and the glass plate is filled with a liquid of refractive index greater than that of glass, the central spot of the pattern is bright. Reason : This is because the reflections in these cases will be from a denser to a rarer medium and the two interfering rays are reflected under similar conditions.

A and B are two points given by (8, 3), (-4, 3). Find the distance between A and B.

Let’s find the distance between two points A(4, 3) and B(8, 6)

In the beginning the space between the plates of a parallel plate capacitor contains air and thereafter it is filled up with a medium of dielectric constant K. Then ......

For a capacitor the distane between two plates is 4x and the electric field between them is E_(0) . Now a dielectric slab having dielectric constant 3 and thickkness x is placed between them in contact with one plate. In this condition what is the p.d. between its two plates ?

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F_1 , when the space between the two lenses is filled with glycerin (which has the same refractive index ( mu = 1.5) as that of glass) then the equivalent focal length is F_2 . The ratio F_1 :F_2 will be :