Threee charges q1, q2 and q3 are placed at the corner of an equilateral triangle

ID: 2132883 • Letter: T

Question

Threee charges q1, q2 and q3 are placed at the

corner of an equilateral triangle where each

side has a length a. The point P is at the

middle of the base line.

Find the potential at P, for the case where

the charges are q1 =

?3 q, q2 = q3 = ?q.

1. VP =k q/a

2. VP = 2k q/a

3. VP = 0

4. VP = ?2k q/a

5. VP = 3k q/a

6. VP = ?4k q/a

7. VP = ?3k q/a

8. VP = 4 k q/a

9. VP = ?k q/a

Consider a di?erent case: q1 =?3 q, q2 = 2 q,

q3 = q. Find the work required to bring

another charge q4 from ? to the point P,

where q4 = q.

1. W??P = 2k q^2/a

2. W??P =k q^2/a

3. W??P = 3k q^2/a

4. W??P = 4 k q^2/a

5. W??P = 5k q^2/a

6. W??P = 8k q^2/a

7. W??P = 6k q^2/a

8. W??P = 9k q^2/a

9. W??P = 10k q^2/a

VP = -2 k q/(a/2) + v3 k q/(v3/2 a) = -4 k q/(a) + 2 k q/(a) = -2 k q/a

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