An `alpha-`particle is accelerated by a potential difference of `10^4 V.` Find the change in its direction of motion, if it enters normally in a region of thickness 0.1 m having transverse magnetic induction of 0.1 tesla. (Given: mass of `alpha-`particle `6.4xx10^(-27)`kg).

Answer

C

Explanation

`r=(mv)/(qB)&1/2mv^(2)=qV=m/(qB)sqrt((2qV)/m)rArr r=sqrt((2mV)/q)1/B=0.2`
`Sin theta=d/r=1/2 rArr theta=30^(@) rArr =0.2m`