Exercises 12.2: pn-junction

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12.2.1 The figure shows the carrier concentrations n (Red and Orange), p (Blue and Green), and charge density (Black and Brown) for a diode under two different bias conditions, RBBl and OGBr. The OGBr case is unbiased.

A) Is the RBBl case with forward or reverse bias?

B) What is ratio of donor concentration on the n-side to acceptor concentration on the p-side for this diode?