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 downward. A positive charge within an electric field that points to the left. A negative charge moving to the left in a magnetic field that points out of the screen. A positive charge moving out of the screen in a magnetic field that points downward. A negative charge moving to the left in an electric field that points out of the screen. A positive charge moving downward in a magnetic field that points upward.

Explanation / Answer

electric force F = E*q

1) Fy = -Ey*-q = + Eq            UPWARD

2) Fx = -Ex*q = -Ex*q        TO THE LEFT

3)

magnetic force Fb = q*(vxB)

Fb = -q*(-vxi x Bzk) = -q*vx*Bz j        DOWNWARD

4)

Fb = +q*(vzk x -Byj ) = +q*vz*By i      to the RIGHT

5)

F = -q*Ezk                       into the screen

6)

Fb = q*(-vyj x Byj) = 0                zero force

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