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amperes angle angle of incidence apparatus axis body bulb calculated calorimeter cell centre charge circuit coefficient coil colour condenser conductor constant convex convex lens copper curve cylinder deflexion density determined diameter direction disc displacement distance electric electrolyte electromotive force electroscope energy equal equation experiment focal length force frequency galvanometer glass Hence horizontal hydrometer incident increased instrument latent heat lens light liquid magnetic field mass measured mercury metal method mirror molecules motion moving needle object observed obtained ohms parallel particles passes piece placed plane plate pole position potential difference potentiometer pressure prism produced radiation radius rays reflected reflexion refraction refractive index resistance retina rotated shown in Fig solution specific heat sphere substance surface telescope temperature thermal thermometer thermopile tube unit vapour velocity vertical vibrations volts volume waves Wheatstone bridge whilst wire zero