Two large metal plates of area 1.0m² face each other are separated by 5cm and carry equal and opposite charges on their inner surfaces. If E between the plates is 55 N/C, find the charge on the plates

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4.88×10^-10C

6.52×10^-12C

7.25×10^-4C

0.99×10^-10C

answer is B.

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Detailed Solution

$\begin{array}{l} E = \frac{σ}{ε_{0}} = \frac{q}{{Aε}_{0}} \Rightarrow q = {Aε}_{0} E \\ q = 1 .0 \times 8 .8 \times 10^{- 12} \times 55 = 4 .88 \times 10^{- 10} C \end{array}$

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