hey v.sabarish,i think u should publish your own book........ come on dude,its really simple. alright just tell me........... HOW CAN U CALCULATE ELECTROSTATIC FORCE BETWEEN TWO CHARGED PARTICLES? I WANT THAT FORMULA...... I THINK AFTER THAT U WILL UNDERSTAND....... AND ITS A BASIC CONCEPT THAT EVERY PARTICLE ON EARTH OR UNIVERSE WANTS TO STABLISE. I THINK U NO THAT WHY WATER FALLS FROM HIGHER HIEGHT TO LOWER HIEGHT??????????? SO,PL. DONT CONFUSE................ AND BLADEX KINDLY TELL ME AND MY EARLIER ANSWER IS CPRRECT OR NOT?????????