in a region of space uniform electric field exist directed downwards . electron entering the region while moving from South to North will be deflected towards?
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Explanation:
ve Y-axis
If the charged particle enters normally into the magnetic field, the force F=Bqv and its direction is perpendicular to both the directions of the velocity of the charged particle and the magnetic field as given by Fleming's left hand rule.
Hence the charged particle follows a circular path of radius r for which the necessary centripetal force
r
mv
2
is given by the magnetic force Bqv.
Hence radius of the circular path r=
qB
mv
.
From this, we can say that the resultant magnetic force acting in +ve Y axis. For the rays to not deflect the electric field should be directed along -ve Y axis.
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