Determine the direction of the force (if any) that will act on the charge in eac

Question

Determine the direction of the force (if any) that will act on the charge in each of the following situations. A negative charge within an electric field that points to the left. A positive charge within an electric field that points upward. A negative charge moving upward in a magnetic field that points out of the screen. A positive charge moving out of the screen in a magnetic field that points to the left. A negative charge moving downward in an electric field that points into the screen. A negative charge moving upward in a magnetic field that points upward.

Explanation / Answer

to the right,: F=qE, Here q is negative, so direction of F is -E

upwards:    F=qE Here  direction of F is E

to the left, F= q v x B, VXB is in right, but q is negative, so F will be in left

downwards, F= q v x B...VXB is in downwards

out of the screen, F=qE, Here q is negative, so direction of F is -E

zero force F= q v x B, vxB=0 as both are parallel vectors

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