Electrostatics — Physics STD 12 Science — Question

Two circular coils have their centres at the same point. The mutual inductance between them will be maximum when their axes

Some charge is being given to a conductor. Then its potential:

A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens an object be placed in order to have a real image of the size of the object(a) 20 cm(b) 30 cm(c) 60 cm(d) 80 cm

In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is (a) 0.08°(b) 0.16°(c) 0.20°  (d) 0.313°

If the frequency of light in a photoelectric experiment is doubled, the stopping potential will:

How many spectral lines does hydrogen have?

Semiconductor is damaged by the strong current due to(a) Lack of free electron(b) Excess of electrons(c) Excess of proton(d) None of these

Work done by an external force in bringing a unit positive charge from infinity to a point is called as: