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# Two thin metal plates are placed close to each other. On the inner side, both plates have a surface charge density of $2.9 \times 10^{−11}\; C m^{−2},$ but of opposite nature. Between the plates, what is the electric force exerted in per unit area?

Can you answer this question?

$(B) 9.5 \times 10^{-11} N/m^2$