If the top of the bar becomes negative relative to the bottom of the bar, what i

Question

If the top of the bar becomes negative relative to the bottom of the bar, what is the direction of the magnetic field?

A copper bar is moving from right to left while its axis and its velocity are maintained perpendicular to a magnetic field (the magnetic field is perpendicular to the plane of the paper). If the top of the bar becomes negative relative to the bottom of the bar, what is the direction of the magnetic field? the magnetic field is zero tesla out of the plane of the paper into the plane of the paper

Explanation / Answer

force on the charge moving with velocity v = q(VxB)

in case of electrons

as upper part is negative => electrons have moved in upper part

=> j = -e(-vixB)

so B must be in -k direction OR into the plane

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