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  4. In figure, two positive charges, q2 and q3 fixed along the y axis, exert a net electric force in the +x direction on a charge q1 fixed along the x axis. If a positive charge Q is added at (x, 0), the force on q1

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Q. In figure, two positive charges, $q_2$ and $q_3$ fixed along the $y$ axis, exert a net electric force in the $+x$ direction on a charge $q_1$ fixed along the $x$ axis. If a positive charge Q is added at ($x$, $0$), the force on $q_1$Physics Question Image

Electric Charges and Fields

Solution:

Since positive charge $q_2$ and $q_3$ exert a net force in the $+ X$-direction on the charge $q_1$ fixed along the $X$-axis, the charge $q_1$ is negative as shown in figure. Obviously, due to addition of positive charge $Q$ at ($x$,$0$), the force on $-q$ shall increase along the positive $X$-axis.

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