An electron in the presence of an electric field experiences an acceleration poi

Question

An electron in the presence of an electric field experiences an acceleration pointing in the positive direction at a particular moment. What can you say about the electric field at the position of the electron at that moment? it points in the positive direction it points in the negative direction it is zero both a and b are possible both a and c are possible both b and c are possible a, b, and c are all possible none of the above are possible If you decided that several answers are possible, what else would you need to know to decide that only one answer is possible? A positively charged ball is traveling in the +x direction when it enters a magnetic field. What do you know about the magnetic force acting on the ball? it points in the +x direction it points in the +y direction it points in the -x direction it points in the -y direction a and c are possible b and d are possible a, b, c, and d are all possible h. none of the above are possible If you decided that several directions are possible, what else would you need to know to decide that only one direction is possible?

Explanation / Answer

3) correct is a). According to Coulomb's law force is attratcive since the chargee are opposite. Thus the elecrton feels a forse from left to rigth (positive charge is placed on its right)

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