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Electric Field Effects on Charge
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If 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?

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Choose the Best Answer

A

28800 N/C

B

14400 N/C

C

7200 N/C

D

3600 N/C

Understanding the Answer

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Answer

The two 2 µC charges are 0. 5 m apart, so the midpoint between them is 0. 25 m from each charge. Because the charges are equal and the point is exactly halfway, the electric field vectors from each charge point in opposite directions with equal magnitude, so they cancel. Thus the resultant electric field at that point is zero.

Detailed Explanation

The electric field from a single charge is k·q/r². Other options are incorrect because This answer uses the correct field from one charge but forgets to add the second field; It mistakenly uses r² twice, as if the distance were squared again.

Key Concepts

Superposition Principle
Field Strength and Distance
Topic

Electric Field Effects on Charge

Difficulty

medium level question

Cognitive Level

understand

Practice Similar Questions

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1
Question 1

When two point charges, one positive and one negative, are placed at a distance from each other, how would you describe the electric field at a point exactly midway between them?

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