Calculating Lorentz Force: Is the Formula the Answer?

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tsang
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Can anybody help me that how to work out the direction of Lorentz Force? Should I work out from the formula? Thanks.
 
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See thumbnail photo of an electron beam (~ 300 volts) being bent into a circle (~ 1 cm diameter arc) by a magnetic field (Helmholz coil). This is an undergraduate physics lab experiment for measuring the electron charge to mass ratio.

Bob S
 

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The equation gives the directions.

[tex]\mathbf{F} = q \left( \mathbf{E} + \mathbf{v}\times\mathbf{B} \right)[/tex]

For a positive test charge there is an electric force in the direction of the applied electric field. There is also a force in the direction of the curl of the charge's velocity and the applied magnetic field. Together these define the Lorentz force.