Identical Point Charges (+20 μC) Are Placed at the Corners

question 28

Multiple Choice

Identical point charges (+20 μC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 μC from infinity to the midpoint of one side of the triangle?

• A) 26 J
• B) 16 J
• C) 23 J
• D) 21 J
• E) 12 J

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