Question

 How much charge is there on a hole? Draw the circuit symbol of p-n junction diode. 
 

Hint:

A hole represents the absence of an electron in a semiconductor, but it effectively behaves like a positive charge carrier.

Answer 1

A hole behaves as a positive charge carrier in a semiconductor, and its charge is equal in magnitude to the charge of an electron but with opposite sign: \[ \text{Charge on a hole} = +e = 1.6 \times 10^{-19} \, \text{C}. \] The circuit symbol of a p-n junction diode is: