Question

what is the meaning of forward bias and reverse bias?

Answer 1

A p-n junction is said to be forward biased if the positive terminal of the external battery is connected to p- side and the negative terminal to the n- side of p- n junction.
A p-n junction is said to be reversed biased if the positive terminal of the external battery is connected to n- side and the negative terminal to the p- side of p- n junction.