nCr#!#Combination#!#P&C

Prove that the number of combinations of n things taken r at a time in which p particular things always occur is .^(n-p)C_(r-p)

If n identical capacitors are connected in series and then in parallel then the ratio of effective capacity in parallel and in series combination i.e. C_(P)/C_(S) is

In a series combination of R, L and C to an A.C. Source at resonance if R = 200 hm, then impedance Z of the combination is

For capacitors in series combination, total capacitance C is given by

Calculate the capacitance of the capacitance of the capacitor C in Fig. The equivalent capacitance of the combination between P and Q is 30 mu F

A capacitor C_(1) is charged to a p.d.V. The charging battery is then removed and the capacitor is connected to an uncharged capacitor C_(2) . The final p.d. across the combination is

Which of the following combinations of quantum numbers is possible for a 4p orbital?