Physics-
General
Easy

Question

Three charges are placed at the vertex of an equilateral triangle as shown in figure. For what value ofblank Q, the electrostatic potential energy of the system is zero?

  1. negative q    
  2. fraction numerator q over denominator 2 end fraction    
  3. negative 2 q    
  4. fraction numerator negative q over denominator 2 end fraction    

The correct answer is: fraction numerator negative q over denominator 2 end fraction

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A 20μF capacitor is connected to 45 V battery through a circuit whose resistance is 2000Ω. What is the final charge on the capacitor?

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physics-General
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