Question - A parallel plate capacitor with 0.3 cm thickness of air between the plates has a capacitance of 15 uuF (micro-micro-Farads). Find the new capacitance when the air is replaced by mica (dielectic constant k = 6)
Classically speaking, the electron of a hydrogen atom moves in a circular orbit or radius 0.53 x 10-10m with a frequency f = 6.6 x 1015 /s. Find the current associated with this orbit.
A small object is placed 10 cm in front of a plane mirror. If you stand behind the object, 30 cm from the mirror, and look at the image - for what distance must you focus your eyes?
A thin, double convex lens has radii of curvature of magnitude 40 cm and is made of glass with refractive index n = 1.65. Find the focal length.