Suppose a new particle is discovered, and it is found that a beam of these parti

Question

Suppose a new particle is discovered, and it is found that a beam of these particles passes undeflected through "crossed" electric and magnetic fields, where E = 365 V/m and B = 0.00142 T. If the electric field is turned off, the particles move in the magnetic field in circular paths of radius r = 2.34 cm. Determine q/m for the particles from these data. Answer in units of C/kg.

Explanation / Answer

first case: net forces acting on the object is=0 B.v.q=E.q =>E=v.B second case: there is only magnetic force acting on : B.v.q=m.v2/r => v=B.q.r/m=>q/m=v/(B.r)=E/B*1/(B.r)=E/(B2*r)=0.8*109(C/kg)

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