Evaluate Feedback Print Orm Course Contents » O Timer Notes - A beam of protons

Question

Evaluate Feedback Print Orm Course Contents » O Timer Notes - A beam of protons is moving in the +x direction with a speed of 18.7 km/s through a region in which the electric field is perpendicular to the magnetic field. The beam is not deflected in this region. If the magnetic fied has a magnitude of 0.914 T and points in the +z direction, what is the magnitude of the electric field? Submit Answer Tries 0/5 What is the direction of the electric field? ty -y -z -X Submit Answer Tries 0/5 Would electrons that have the same velocity as the protons be deflected by these fields? If so, in what direction would they be deflected? Yes,-X OYes, +y Yes, +x Yes,y O No Yes, -z Yes, +z Submit Answer Tries 0/5 Throaded View Chonoloical View other Views. x.general. references on what is marked s N Export Mark NEW posts no longer new NEW HINT/CLARIFICATION John Buncher Reply (Tue Mar 20 11:08:10 am 2018 (CDT) Remember, if "+x" is to the right, and "+y" is up (towards the top of the page), then "+z" is out of the page

Explanation / Answer

here,

the speed of proton , v = 18700 m/s i

the magnetic feild , B = 0.914 T k

let the electric feild be E

equaitng the forces

q * v * B = q * E

18700 * 0.914 = E

E = 1.7 * 10^4 N/C

the direction of magnetic force is in -y direction

so the elctric force is in +y direction

and the elctric feild must be in +y direction

when electron beam is present

the magnetic force is in +y direction

so the elctric force is in -y direction

as the electron is negatively charged

the elctric feild must be in +y direction

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