TA - MP10: e/m for electrons, Electric and Magnetic forces...

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MP10: e/m for electrons, Electric and Magnetic forces In this lab we will complete the following tasks: (page 1) - Study the magnetic force on electrons - Determine the charge/mass (e/m) ratio for electrons - Study the electric force on electrons - Measure the deflection of an electron beam due to the electric force
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A beam of electrons with velocity is generated inside an evacuated tube shown in the figure. The electrons start at rest at point C and are accelerated towards point A by a voltage applied betwen p CA v V oints A and C. The electron velocity is given by: 2 CA v eV v m = In the presence of a uniform magnetic field applied perpendicular to the electrons 2 1 move along a circular orbit of radius . The electron beam is made visible / when it hits a fluoresc CA Bv V R Be m = G G ent mica sheet placed inside the electron tube. The uniform magnetic field is generated by a pair of Helmholtz coils positioned on either side of the electron tube. A current passes through the I () coils prodicing a magnetic field 16
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TA - MP10: e/m for electrons, Electric and Magnetic forces...

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