Ten00 how forces cancel Each sketch below shows three objects with an electric c

Question

Ten00 how forces cancel Each sketch below shows three objects with an electric charge. In each case, decide whether there is a net force acting on the central object, which is larger and outlined in green. If there is a net force, decide whether it pushes the center object to the left or right. Then select the appropriate button under the sketch. For example, If there is a net force pushing the central object in the first sketch to the left, select the left button under the first sketch. If there is no net force on the central object in the second sketch, select the middle button under the second sketch. And so on.

Explanation / Answer

Recall that

Fleft = k*Q1*Qleft/(Dleft^2)

for each vlaue so

Fright= k*Q1*Qright/(Dright^2)

then, if

Fright > Fleft, expect movement to the right

and vice versa...

Recall that increase in distance affects ^2

then..

A)

central speices is -1; then there is:

- repealling from left side

- attraction form right side

expect movement to the RIGHT

B)

centrla species is +3

then,

- expect attraction from left side

- expect attraction from right side

expect left side to be stronger since:

- It is nearest, it has 3x charge

C)

finally

there is no net movement

since

Fleft = Fright

same charges, same distances

this is in equilbirium

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