# Physics II Lab w answers_Part_17 - Experiment 8 Measurement...

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45 Experiment 8 Measurement of m e by Thomson’s bar magnet method Apparatus: Cathode ray tube (CRT) with power supply unit, one pair of bar magnets, high resistance voltmeter, magnetometer, and stopwatch. Purpose of the experiment: To measure the specific charge, i.e. charge to mass ± ² ³ ´ µ m e ratio, of an electron using Thomson’s bar magnet method. Basic Methodology: Electrons in a CRT are deflected in the vertical direction by applying a potential between the vertical deflection plates of the CRT. A magnetic field perpendicular to the deflecting electric field is produced using a pair of the bar magnets. The position of the magnets is adjusted so as to cancel the deflection of the electrons. The knowledge of the deflecting potential and the magnetic field of the bar magnets leads to a calculation of the specific charge. I. Introduction We have learnt that the electron has a negative charge whose magnitude e equals 1.6x10- 19 Coulomb and mass (m) equal to 9.1 x 10 -31 Kg. Millikan's Oil Drop method

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Physics II Lab w answers_Part_17 - Experiment 8 Measurement...

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