In an unbiased semiconductor diode, the depletion region is formed where the free electrons and holes recombine, resulting in a region with no free charge carriers. This is a key characteristic of the depletion region in a p-n junction diode.
The circuit shown in the figure contains two ideal diodes \( D_1 \) and \( D_2 \). If a cell of emf 3V and negligible internal resistance is connected as shown, then the current through \( 70 \, \Omega \) resistance (in amperes) is: 