A parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is \(4\;kV/cm\), the electric field in the region B, in \(kV/cm\), is
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A parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is \(4\;kV/cm\), the electric field in the region B, in \(kV/cm\), is