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Question

# 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:

A
shall increase along the positive x-axis
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B
shall decrease along the positive x-axis
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C
shall point along the negative x-axis
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D
shall increase but the direction changes because of the intersection of Q with q1 and q3
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Solution

## The correct option is A shall increase along the positive x-axisSince positive charge q2 and q3 exert a net force in the +X direction on the charge Q1 fixed along the X-axis, the charge q1 is negative as shown in figure. Obviously, due to addition of positive charge Q ad (x,0) the force on −q shall increase along the positive X-axis.

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