In a chamber, a uniform magnetic field of 6.5G ( `1G = 10^(-4) T)` is . Maintained . An electron is shot into field witha speed of `4.8 xx 10^(6) ms^(-1)` normal to the field . Explain why the path of the electron is a circle. Determine the radius of the circular orbit.
`(e = 1.6 xx 10^(-19) C, m = 9.1 xx 10^(-31) kg)`

Explanation

`B=6.5 xx 10^(-4) T,v= 4.8 xx 10^(6) ms ^(-1)`
`Bqv = (mv^2)/(r) , r = (mV)/(qB)= (9.1 xx 10^(-31) xx 4.8 xx 10^6)/(1.6 xx 10^(-19) xx 6.5 xx 10^(-4)) = 4.2 xx 10^(-2) m = 4.2 cm `