If the radius of the octahedral void is r and redius of the atoms in close-packing is R, derive relation between r and R.

If the radius of the octahedral void is r and the radius of the atoms in the packing is R, derive relationship between r and R.

When a battery of e.m.f E and internal resistance r is connected to a resistance R, a current I flows throgh it. Derive a relation between E,I,r and R.

If relation R defined on set A is an equivalence relation, then R is

If radius of second stationary orbit (in Bohr's atom) is R then radius of third orbit will be :

How many octahedral voids are there are in 1 mole of a compound having cubic closed packed structure?

Two circular coils, one of radius r and other of radius R are placed coxially with their centres coinciding. For R >> r, obtain an expression for mutual inductance of the arrangement.

What is the relationship between the edge length (a) of the unit cell and radius ( r) of an atom in a face centred unit cell?