Entropy of a general spherically symmetric and charged evaporating black hole
一般球对称带电蒸发黑洞的熵

Starting from the null surface equation, we obtain the event horizon of a general spherically symmetric and charged evaporating black hole. Using Klein Gordon equation, thin film brick wall model and WKB approximation, we obtain the entropy of a general spherically symmetric and charged evaporating black hole. This entropy is proportional to the area of event horizon.