Back to Magnetic Fields, Field Lines, and Force — Problem 2 · Task Set 12

Exercises: Magnetic Fields, Field Lines, and Force

Work through each section in order. Show your work where indicated. For direction problems, state your answer as a cardinal direction (up, down, left, right, into page, out of page) or compass direction as appropriate.

Grade 11·22 problems·~30 min·OpenStax Physics (High School)·section·sec-20-1

Work through problems with immediate feedback

Fluency Practice

3D coordinate system showing velocity v pointing right along x-axis, magnetic field B pointing up along y-axis, with the force direction to be determined using the right-hand rule

A proton ( $q = +e$ ) moves to the right (in the $+x$ direction) through a magnetic field pointing upward (in the $+y$ direction). Using the force right-hand rule (fingers along $v$ , curl toward $B$ , thumb gives $F$ ), what is the direction of the magnetic force on the proton?

Out of the page (in the $+z$ direction)

Into the page (in the $-z$ direction)

Upward (in the $+y$ direction)

Downward (in the $-y$ direction)