Three 250-μC Charges Are Placed on Tiny Conducting Spheres at the the Ends

question 1

Multiple Choice

Three 2.50-μC charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on the knot at the center is ​ ​

• A)0.
• B)3.75 × 10⁻².
• C)5.63 × 10⁻².
• D)6.50 × 10⁻².
• E)7.50 × 10⁻².

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