When Charges Q_a,q_b,and Q_c Are Placed Respectively at the Corners

question 53

Multiple Choice

When charges q_a,q_b,and q_c are placed respectively at the corners a,b,and c of a right triangle,the potential at the midpoint of the hypotenuse is 20 V.When the charge q_a is removed,the potential at the midpoint becomes 15 V.When,instead,the charge q_b is removed (q_a and q_c both in place) ,the potential at the midpoint becomes 12 V.What is the potential at the midpoint if both charges q_a and q_c are removed?

• A)8 V
• B)5 V
• C)7 V
• D)13 V

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