A charged particle leaves a potential difference with a speed of 1200m/s and is

Question

A charged particle leaves a potential difference with a speed of 1200m/s and is headed east. The particle then enters a uniform magnetic field directed into the page with magnitude 21.41T. When the particle enters the uniform field, it undergoes a specific type of motion, of which begins turning the particle toward the south. If this motion has a radius of 10.68 cm and the magnitude of the charge on the particle is 3.20uC (mu), determine the mass of the particle. Is the charge on the particle postive or negative. How do you know?

Explanation / Answer

the force on the particle

F = Bqv

centripetal force F = mv2/r

Bqv = mv2/r

m =Bqr/v = 21.41*3.2*10-6*0.1068/1200

m = 6.0975*10-9 kg

from the right hand rule

charge is negative

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