Physics

Problem

Two positive ions P and Q are singly and doubly ionised respectively. Ion P has mass

m

and charge

+e

; ion Q has mass

4m

and charge

+2e

. Both are accelerated through the same potential difference

V

and then enter, perpendicularly, the same uniform magnetic field

B

. If the radius of the circular path of ion P is

r

, the radius of the path of ion Q is a)

2r

\dfrac{r}{\sqrt{2}}

r\sqrt{2}

r