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

Question

Quizplus · Accepted Answer

The potential at the midpoint of the hypotenuse is due to the charges at the corners a and c. When q_a is removed, the potential at the midpoint decreases by 5 V, which means that q_a contributes 5 V to the potential at the midpoint. Similarly, when q_c is removed, the potential at the midpoint decreases by 8 V, which means that q_c contributes 8 V to the potential at the midpoint. Therefore, if both q_a and q_c are removed, the potential at the midpoint will decrease by 5 + 8 = 13 V, which is 20 V - 13 V = 7 V.

When Charges Qa,qb,and Qc Are Placed Respectively at the Corners

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