12 Netting
12 Netting
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Four point charges have the same magnitude of 2.4 ×10-12 C and are fixed to the corners of a square that?
Four point charges have the same magnitude of 2.4 ×10-12 C and are fixed to the corners of a square that is 4.0 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.
Let the magnitude of each charge = q
The charge -q at one corner can be replaced by two charges +q and -2q
The net electric field at the center of the square due to the four +q charges at the four corners = 0
The distance of the center from the -2q charge = sqrt(2.0^2 + 2.0^2) = 2.0 sqrt(2) cm
= 0.02 sqrt(2) m
The magnitude of th net electric field at the center due to the given charges
= K |-2q|/[0.02 sqrt(2)]^2
= 8.99 * 2 * 2.4 * 10^-12/(8 * 10^-4)
= 5.4 * 10^-8 N/C
Ans: 5.4 * 10^-8 N/C
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