Physics

A beam of unknow charged particles passes at right angles to the direction of magnetic field of 9.0 x 10^-2 T. if the speed of the particles is 3.0 x 10^4 m/s and the force experiences by a particle is 8.64 x 10^-16 N. How many electric charges are carried by one particle?

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1. Use F = q V B to solve for the charge, q, in Coulombs.

F is the force (N) B the magnetic field (Tesla) and V is the velocity (m/s).

If they mean how many ELECTRONS (positive or negative) the particle's charge corresponds to, divide q by the electron charge, e. That will give you the number of extra or missing electrons.

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2. I solved and got 3.2 x 10^-19 Coulombs.
What value do I divide that by?

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3. The electron charge, e. You should know it.

http://en.wikipedia.org/wiki/Electron

It looks like you have two electrons.

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