Part A Three points (A, B, and C) are drawn on equipotential lines as shown in F
ID: 1537026 • Letter: P
Question
Part A
Three points (A, B, and C) are drawn on equipotential lines as shown in Fig 4. The charges produces the equipotential are not shown. A proton is released from point A. What is the direction of the electric force acting on the proton?
A . Down. Charges move easiest along the equipotential.
B. To the left. Charges seek a lower energy, which is charge times potential. It heads to the closest point on the 60-V line.
C. To the right. Charges tend to move towards the higher potential. The 80-V potential is higher than the 70-V potential.
D. Up. It is repelled by the positive charge at C.
E. There is not enough information to determine this.
Part B
The proton is gone. An electron is released from point B in Fig. 4. What is the direction of the electric force acting on the electron? Explain.
A. To the right. Charges seek a lower energy, which is charge times potential. Since the charge is negative, it heads to the closest point on the 80-V line, a lower potential energy.
B. Down. It is attracted by the positive charge at C.
C. There is not enough information to determine this.
D. To the left. Charges tend to move towards the higher potential. The 60-V potential is higher than the 70-V potential because the charge is negative.
E. To the right. It’s attracted by the proton
F. Up. Charges move easiest along the equipotential.
Part C
An electron is released from Point B and a second electron is released from Point C in Fig. 4. There is no charge at point A. B and C are far enough away from each other that the two electrons do not affect each other. Compare the electric forces experienced by these electrons the instant they are released.
A. The electron released at point B experiences a greater force.
B. Electrons released from point B and C would experience equal forces.
C. The electron released at point C experiences a greater force.
D. The relationship between the two forces cannot be determined with the information provided.
40 V 50 V 80 V 70 V 60 VExplanation / Answer
Answers:
B. To the left. Charges seek a lower energy, which is charge times potential. It heads to the closest point on the 60-V line.
A. To the right. Charges seek a lower energy, which is charge times potential. Since the charge is negative, it heads to the closest point on the 80-V line, a lower potential energy.
C. The electron released at point C experiences a greater force.