5. 4 points MI4 15.6.050 My Not You stand at location A, a distance d from the o

Question

5. 4 points MI4 15.6.050 My Not You stand at location A, a distance d from the origin, and hold a small charged ball. You find that the electric force on the ball is 0.096 N. You move to location B, a distance 2d from the origin, and find the electric force on the ball to be 0.0959 N. What object located at the origin might be the source of the field? (Select all that apply a point charge a dipole a uniformly charged rod (for d L) a uniformly charged ring (for d R) a uniformly charged disk (for d R) a uniformly charged hollow sphere none of the above If the force at B were 0.012 N, what would be your answer? (Select all that apply.) a point charge a dipole a uniformly charged rod (for d L) a uniformly charged ring (for d R) a uniformly charged disk (for d R) a uniformly charged hollow sphere none of the above

Explanation / Answer

1. Electric field is uniform i.e., independent of distance in case of uniformly charged disk. (d <<R). As per the given data electric field at d and 2d is same. Hence the charged body is uniformly charged disk.

2. In case of uniformly charged rod electric field is inversely proportional to distance (d). As per given data electric field become half as distance increased to 2d. Hence the charged object is uniform charged rod.

3. electric field become one forth as distance became 2d. It happens in two cases 1) point charge and 2) hallow spherical charge. In both the cases the electric field is inversely proportional to square of distance. Hence answer is point charge and hallow spherical charge.

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