Two charges q1 and q2 are separated by a distance d and exert a force F on each

Question

Two charges q1 and q2 are separated by a distance d and exert a force F on each other. What new force F ? would exist if q1 is tripled?

1. F ? = 9 F

2. F ? = 1/9 F

3. F ? = 3 F

4. None of these

5. F ? = 1/3 F

6. F ? = 0

What new force F ? would exist if q1 and q2 are cut in half? 1. F ? = 1/2 F 2. F ? = 1/4 F 3. F ? = 0 4. F ? = 4 F 5. None of these 6. F ? = 2 F

What new force F ? would exist if d is quadrupled? 1. F ? = 0 2. F ? = 4 F 3. F ? = 16 F 4. None of these 5. F ? = 1/4 F 6. F ? = 1/16 F

What new force F ? would exist if d is cut in half? 1. F ? = 0 2. None of these 3. F ? = 1/4 F 4. F ? = 1/2 F 5. F ? = 4 F 6. F ? = 2 F

What new force F ? would exist if q1 is tripled and d is doubled? 1. F ? = 16/9 F 2. F ? = 0 3. F ? = 4/3 F 4. None of these 5. F ? = 9/16 F 6. F ? = 16/4 F 7. F ? = 4/16 F 8. F ? = 3/4 F

Explanation / Answer

F = k*q1*q2/d^2

F' = k*3*q1*q2/d^2 = 3*k*q1*q2/d^2 = 3F

3. F ? = 3 F <-----answer

-----------------

F' = k*(q1/2)*(q2/2)/d^2 = k*q1*Q2/4d^2 = F/4

F' = F/4

option 2

++++++++++++

F' = k*q1*q2/(4d)^2 = k*q1*q2/16d^2 = F/16

F' = (1/16)*F

option 6

++++++++++

F' = k*q1*Q2/(d/2)^2 = 4*k*q1*q2/d^2 = 4*F

F' = 4 F

option 5

+++++++++

F' = k*3*q1*q2/(2d)^2 = k*3*q1*q2/4d^2 = (3/4)*k*q1*Q2/d^2 = (3/4)*F

F' = 3/4 F

option 8

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

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