The electric potential at two points in space is: V1 = 200 volts and V2 = 300 volts. Which of the following statements is true for moving a point charge q from point 1 to 2?
A. The work done by an external agent to move q from point 1 to 2 is positive.
B. We can't determine the work done because we don't know the direction of V at the two points.
C. The work done by the electric force exerted on q in moving it from point 1 to 2 is W = q(100 V).
1.A
2.B
3.C
4.A and B
5.A and C
6.B and C
7.A, B, and C
8.None of the above
Question 2We construct a closed Gaussian surface in the shape of a spherical balloon. Assume that a small glass bead with total charge Q is in the vicinity of the balloon. Consider the following statements:
A. If the bead is inside the balloon, the electric flux over the balloon's
surface can never be 0.
B. If the bead is outside the balloon, the electric flux over the balloon
surface must be 0.
Which of these statements is valid?
1.Only A is valid.
2.Only B is valid.
3.Both A and B are valid.
4.Neither one is valid.
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