3. An electron traveling horizontally enters a region where a uniform electric f

Question

3. An electron traveling horizontally enters a region where a uniform electric field is directed upward. What is the direction of the force exerted on the electron once it has entered the field? electron A) B) C) D) E) downward out of the page, toward the reader to the right upward to the left 4. A point charge+Q is located on the x axis at x a, and a second point charge -Ois located on the x axis at x-a. A Gaussian surface with radius r= 2a is centered at the origin. The flux through this Gaussian surface is A) greater than zero. B) zero because at every point on the surface the electric field has no component perpendicular to the surface. C) D) E) zero because the electric field is zero at every point on the surface. zero because the negative flux over one hemisphere is equal to the positive flux over the other none of the above.

Explanation / Answer

3)
A) Electron will move downward.
The electric field is directed from positive region to negative region. Downward region is positive and the negatively charged electron will be attracted to the downward positive region.

4)
D) zero because the negative flux over one hemisphere is equal to the positive flux over the other.
Also, the total charge enclosed by the Guassian surface is zero and so is the total electric flux

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