(a) What are majority and minority charge carriers in an extrinsic semiconductor ? (b) A p-n junction is forward biased. Describe the movement of the charge carriers which produce current in it. (c) The graph shows the variation of current with voltage for a p-n junction diode. [Graph showing I (mA) vs V (volts)] Estimate the dynamic resistance of diode at $V = -0.6\text{ volt}$.