Derive the expression of escape speed.

Derive the expression of terminal velocity of a body in liquid.

Derive the expression for the equivalent focal length of a combination of two thin convex lenses in contact.

A parallel plate capacitor has plate separation "d" and the area of each plate is "A". The space between the plates is completely filled with a dielectric of constantK. Derive the expression for the capacity of the parallel plate capacitor.

Why is an insulator sometimes called a dielectric? What is the main difference between free and bound charge? Generally one of the two plates of a Capacitor System is earthed, why? Derive the expression for the energy stored in a charged capacitor.

Derive an expression for excess of pressure in a liquid drop.

Derive the expression for the magnetic force acting on a current carrying straight conductor placed in a uniform magnetic field and express it in vector form.

Derive the expression for de Broglie wavelength of an electron moving under a potential difference of V volts.