You measure the electric field at a certain distance, d, from an unknown charge

Question

You measure the electric field at a certain distance, d, from an unknown charge distribution as 1.8 × 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 point charge A dipole C) A uniformly charged ring D) A long (compared to d), uniformly charged rod E:) A large (compared to d), uniformly charged plate

Explanation / Answer

ratio of fields,

= 1.8 x 10^4 / (2 x 10^3)

= 9

means E is directly related to 1/r^2.

E = k / r^2

(A) yes, this can be a point charge.

(B) dipole = k / r^3

(c) for large distance,

E = k / r^2

(d) E = k/r

(e) E = constant

Ans : A & C

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.