An ion with charge q

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

Problem

7. An ion with charge q , mass m , and speed

v

enters a magnetic field B and is deflected into a path with a radius of curvature R . If a second ion has speed

2 v

, while

\mathrm{m}, \mathrm{q}

, and B are unchanged, what will be the radius of the second ion's path? (A)

4 R

(B)

2 R

(C)

R / 2

(D)

R / 4