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Electrolysis and Electrolytes

In mass spect...

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In mass spectrograph we first take a molecular sample and then convert into positive ions why ? And it is given that these ions are then allowed to pass through uniform electric and magnetic field which make them execute circular motion . the radius of the circular path is proportional to the mass of charged particle and hence gives the molecular mass . how the molecular mass is calculated in terms of radius and mass of charged particle ?

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Q. Ions of same charge and velocity but of different masses pass through a uniform transverse magnetic field, the radii of the paths depend on the masses. (This is the principle of a mas spectrograph). Among the following the correct relation between the radius and mass is :

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