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Question
an electron is accelerated through a potential difference of 5kv and enters a uniform magnetic field of 0.02 wb/m2 acting normal to the direction of electron motion. Determine radius of the path.
Solution
for the case of acceleration due to electric field
`1 / 2 mv^2 = eV`
`V = sqrt((2e)/m xx V`
And for the case of transverse field
` BeV = (mV^2 )/ R`
`R = (m/e)(V/B)`
`= (m/e)(V/B)sqrt((2e)/m xx v)`
`=1/B sqrt((2xx9.1xx10^(-31) xx 5xx10^3)/(1.6 xx 10^(-19)`
= 0.012 m
R = 12mm