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Part I: Charge configurations
1. Electric Field
To determine the effect of a charge would be at every point surrounding of it, we need same sort
of reference. That reference is a test charge.
Field map gives the map of electric filed due to a charge. The equation for the force between two
electric charges is:
F =K * Q1 Q2
If we want to work out the effects on any charge, we only have to multiply the vector of the test
charge by the magnitude of the new charge.
If we want to map the field for Q, the we need to know exactly what would hapen if we put Q2 at
every point around Q1. But this obviously on the value of Q2 by convention, we choose
The lecetric filed strength is just the force per unit charge and has the same magnitude and
direction as the force on our test charge.
E =K * Q1
. . F =E*Q
2. Positive Charge acting on test charge
As both the charges are postive, they repel each other, we can see that at ever point the positive
test charge would experience a force pushing it away from the carge Q.
3. Negative Charge acting on test charge
The arrows are in the same length because the magnitude of the charge is the same and so is
magnitude of test charge. Thus, the magnitude of the force is the same.
The arrows point in the opposite direction because the charges now have opposite sign and so the
test charge is attracted to the charge.
*Important points to remember about Electronic Point*
There is an Electric Filed at every point in space surrounding charge.
Filed wires are merely a representation
It always start at a right angle...