Two positive ions P and Q are singly and doubly ionised respectively

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

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

(b)

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

(c)

r\sqrt{2}

(d)

r