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Question

A particle moves in a circle of diameter 1.0 cm under the action of a magnetic field of 0.40 T. An electric field of 200 V m1 makes the path straight. Find the charge/mass ratio of the particle.


Solution

r=0.5×102 m, B=0.4t, E=200 v/m

The path will straighten if

qE=qVB

         V=EB=500 m/s.

Since,       r=mVqB

qm=VrB=2.5×105 C/kg

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