(a) At a certain instant, a proton is moving in the positive y direction through

Question

(a) At a certain instant, a proton is moving in the positive y direction through a magnetic field in the negative z direction.

What is the direction of the magnetic force exerted on the proton? Identify this as a positive or negative coordinate direction.

(b) A long vertical, metallic wire carries upward electric current. What is the direction (chosen from the list below) of the magnetic field it creates at a point 2 cm horizontally north of the center of the wire?

a)north b)south c)east d)west e)up f)down

ty Use the right-hand-rule and this three-dimensional coordinate axis (where the +z direction is out of the page) to answer this question.

Explanation / Answer

a) The force is on the proton is F= VxB, here, Vy*B(-z), -x direction

b) East , similarly use Right hand rule

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