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Three charges Q1,Q2 and q are located on the same line as shown in figure.If Q1=+15nC...

Three charges Q1,Q2 and q are located on the same line as shown in figure.If Q1=+15nC ,Q2=-9nC,q=+5nC ,a=2cm and b= 3cm , what is magnitude and direction of the electrical force on q?

Q1---2cm--------Q2-----3cm --------q

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Answer #1

Force between two point charges is given by

The electric force on the charge q is the vector sum of the electric force due to individuao charges.

Force due to Q1 is

Force due to Q2 is

So, the net force on the charge q is

So, the magnitude of the net force is 1.8 x 10-4 N and the direction is in -x direction (towards the given charges).

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