In a velocity selector for ions,when the electric field is increased 50%,what change in the magnetic field is necessary to select the same speed as before?
A) a 50% decrease
B) a 25% decrease
C) no change
D) a 25% increase
E) a 50% increase

Question

Quizplus · Accepted Answer

In a velocity selector, the condition for selecting ions of a specific speed is that the electric force equals the magnetic force, i.e., E = vB. If the electric field (E) is increased by 50%, to maintain the same speed (v), the magnetic field (B) must also be increased by 50% to keep the ratio E/B constant.

In a Velocity Selector for Ions,when the Electric Field Is