A point charge $Q = - 12 \mu \mathrm { C }$, and two other charges $q _ { 2 }$ and $q _ { 2 }$, are placed on $x - y$ axes as shown in the figure. The electric force components on charge $Q$ are $F _ { x } = + 0.005 \mathrm {~N}$ and $F _ { y } =$ $- 0.003 \mathrm {~N} . \left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } , e = 1.6 \times 10 ^ { - 19 } \mathrm { C } \right)$
(a) How many excess electrons are there in charge $Q$ ?
(b) What are the charges $q 1$ and q2, including their signs?

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The Answer of A point charge $Q = - 12 \mu \mathrm { C }$, and two other charges $q _ { 2 }$ and $q _ { 2 }$, are placed on $x - y$ axes as shown in the figure. The electric force components on charge $Q$ are $F _ { x } = + 0.005 \mathrm {~N}$ and $F _ { y } =$ $- 0.003 \mathrm {~N} . \left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } , e = 1.6 \times 10 ^ { - 19 } \mathrm { C } \right)$
(a) How many excess electrons are there in charge $Q$ ?
(b) What are the charges $q 1$ and q2, including their signs?

A Point Charge Q=−12μCQ = - 12 \mu \mathrm { C }Q=−12μC

A Point Charge $Q = - 12 \mu \mathrm { C }$