Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
The electric field is zero because the fields from both charges cancel each other out.
B
The electric field is directed toward the negative charge.
C
The electric field is directed away from the positive charge.
D
The electric field is the sum of the two charges' fields, pointing in the same direction.
Understanding the Answer
Let's break down why this is correct
Answer
The electric field is the sum of the fields from each charge, added as vectors. A positive charge pushes field lines outward, while a negative charge pulls them inward, so the directions of the two fields at the midpoint are opposite. Because the charges are equal in magnitude and the point is exactly halfway, the two fields have the same size but opposite direction. When added together they cancel, leaving a net electric field of zero at that point. For example, two 5 µC charges 10 cm apart give a field of 0 N/C at the middle.
Detailed Explanation
At the midpoint, the positive charge pushes a test charge away while the negative charge pulls it toward. Other options are incorrect because It is easy to think all fields point toward the negative charge; It is common to assume the field always points away from the positive charge.
Key Concepts
Superposition Principle
Topic
Electric Field Effects on Charge
Difficulty
easy level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1If two positive charges, each of 2 µC, are placed 0.5 meters apart, what is the resultant electric field strength at a point located 0.25 meters from the center of the line connecting the two charges?
mediumPhysics
Practice
2
Question 2When the distance between two charged plates is increased, what is the primary effect on the electric field strength between them?
easyPhysics
Practice
3
Question 3Which of the following statements correctly describe the relationship between electric field strength, distance between charged plates, and capacitance? Select all that apply.
mediumPhysics
Practice
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