Question

Does the human body have a positive or negative charge

Answer 1

The human body's resistance is in good electrical contact about 1000 Ω, thus no greater obstacle to electrons, either to or from.So we are mostly unloaded as long as we are grounded.If we are electrically isolated from our environment, we can upload electricity which is generated of our muscles and nerves, but this is flowing away through our various intra and extracellular electrolytes.This electricity - in the order of a few micro watts - has no importance whatsoever for our body.

Answer 2

Its not straight forward and there is no generic answer to this question. Human body is electrically conductive. Unlike non-living objects, our body is very dynamic. Whether electrically charged or not is more defined in the context of electrical phenomena of Capacitance i.e. ability of a body to store electrical charge. In reality any capacitor will have both polarity when charged. The quantity at which the charging occurred is represented as Voltage (potential difference). 

Now if the question more clearly becomes whether human body has capacitance? answer is yes. Human body can charge up to 3 KV. and can be up to 100 pF of capacitance.