EXPERIMENT 11 Determination of e/m for the Electron Introduction
The ratio of charge to mass e/m
LEP 5.1.02 Specific charge of the electron – e/m
5 thg 1 2002 Cathode rays
Electron Charge to Mass Ratio e/m
18 thg 1 2010 son investigating the cyclotronic motion of an electron beam. From the empirical ... (here
Measuring the e/m ratio
By studying the centripetal acceleration of electrons in a magnetic field Thomson was able to successfully determine their charge-to-mass ratio. Thomson's work
The e/m ratio
Objective To measure the electronic charge-to-mass ratio e/m by injecting electrons into a magnetic field and examining their trajectories. We also estimate
e/m Experiment (Magnetron Method)
Electrons emitted by the cathode travel radially to the anode (see Figure 1) however in the presence of an axial magnetic field (which can be obtained by
MEASUREMENT OF e/m OF THE ELECTRON
2. To measure the charge to mass ratio of an electron. Theory. When an electron moves in a magnetic field
Measurement of Charge-to-Mass (e/m) Ratio for the Electron
Experiment objectives: measure the ratio of the electron charge-to-mass ratio e/m by studying the electron trajectories in a uniform magnetic field. History.
Lab 1: Determination of e/m for the electron
This experiment measures e/m the charge to mass ratio of the electron. This ratio was first measured by J. J. Thomson in 1897. He won a Nobel prize for his
Object:
To determine e/m (Specific Charge) for an electron by magnetron method.Apparatus Used:
e/m apparatus consisting of power supply fitted with voltmeter and ammeter to read anode
voltage (in volts), anode current (micro amp), solenoid power supply fitted with ammeter to read solenoid current(amp), magnetron valve with base and connecting wires, solenoid fitted with suitable wooden base.
Description:
A magnetron is a thermionic valve with cylindrical coaxial anode and cathode. Electrons emittedby the cathode travel radially to the anode (see Figure 1), however in the presence of an axial magnetic
field (which can be obtained by placing it inside a solenoid) the path of electrons become curved. At acritical value of the magnetic field, the path of electrons just touch the anode, any further increase in
magnetic field strength will result in the path of electrons so curved that they do not reach the anode
hence the anode current falls to zero. Measurement of this critical field can be used to determine e/m.
Formula Used :
e/m (Specific Charge) for an electron is given by WhereV= Anode potential
Ra= Anode radius
Bc= magnetic field corresponding to critical solenoid current IcTheory:
Magnetron arrangement consists of a cathode in form of a wire fitted at the axis of a cylindricalanode of radius Ra exists radially. A magnetic field parallel to the axis of cathode (filament) is superposed upon the electric
field by placing the magnetron inside a solenoid such that its axis is coincident with solenoid axis. The
strength of the magnetic field may be varied by controlling the solenoid current Ic .Let us assume the electrons emit from the cathode with zero initial velocity and begin to
Magnetic Field (B) does not change the speed of an electron however modifies the trajectory of an electron depending on the magnitude of B. Following conditions may arise: (a) B=0 electrons will move radially outwards and strike anode (b) BBc can then be calculated as
Where Ic =Critical value of solenoid current for cut-off (in amp)N= number of turns per meter of the solenoid
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