Problem 10 (6.25 pts): You measure the electric field at a certain distance, d,

Question

Problem 10 (6.25 pts): You measure the electric field at a certain distance, d, f 1.8 rom an unknown charge distribution as × 104 N/ C. You then move to a new location that is three times the distance away from the charge distribution. At this new location, you measure the electric field to be 2 × 103 N C Which of these charge distributions is the most likely source of the electric field? A) A point charge B) A dipole C) A uniformly charged ring D) A long (compared to d), uniformly charged rod E) A large (compared to da), uniformly charged plate

Explanation / Answer

Solution: Given E1 = 1.8 x 104

and E2 = 2 x 103

For point charge E1/E2 = (d2/d1)2

Now E1/E2 = 9 and (d2/d1)2 = (3d/d)2 = 9

So charge distribution will be point charge (A)

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