CBSE 2022|पदार्थों का पृथक्करण -L6|Separation of Substances|Class 6 NCERT विज्ञान |8PM |Subhadra Mam

A mole is a collection of 6.022 xx 10^23 particles and the number 6.022 xx 10^23 is called Avogadro number. The mass of this number of atoms in an element is equal to its gram atomic mass and mass of this number of molecules in a compound is equal to its gram molecular mass. The volume occupied by this number of molecules of a gas at N.T.P is 22.4 L. When 6.022 xx 10^23 molecules of a substance are dissolved in 1L of solution, the solution is known as 1 molar volume. The mass of 10 molecules of naphthalene (C_(10)H_(8))

Two parallel vertical metallic rails AB and CD are separated by 1m . They are connected at the two ends by resistances R_1 and R_2 as shown in the figure. A horizontal metallic bar l of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is a uniform horizontal magnetic field of 0.6 T perpendicular to the plane of the rails. It is observed that when the terminal velocity is attained, the powers dissipated in R_1 and R_2 are 0.76W and 1.2W respectively (g=9.8m//s^2) The terminal velocity fo the bar L will be

Two parallel vertical metallic rails AB and CD are separated by 1m . They are connected at the two ends by resistances R_1 and R_2 as shown in the figure. A horizontal metallic bar l of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is a uniform horizontal magnetic field of 0.6 T perpendicular to the plane of the rails. It is observed that when the terminal velocity is attained, the powers dissipated in R_1 and R_2 are 0.76W and 1.2W respectively (g=9.8m//s^2) The value of R_1 is

Two parallel vertical metallic rails AB and CD are separated by 1m . They are connected at the two ends by resistances R_1 and R_2 as shown in the figure. A horizontal metallic bar l of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is a uniform horizontal magnetic field of 0.6 T perpendicular to the plane of the rails. It is observed that when the terminal velocity is attained, the powers dissipated in R_1 and R_2 are 0.76W and 1.2W respectively (g=9.8m//s^2) The value of R_2 is