electrostatic charge of viruses, especially Coronaviruses
This is a great biological question! It asks a lot about how empirical science is done in the field of modern biology! I'm glad we encourage such questions from curious people who want to learn more.

Via: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4213776/#!po=1.19048


  All viruses are coated with proteins and contain genetic material which can either be DNA or RNA. Since both nucleic acids have phosphodiester bonds, the genetic material provides a partial negative charge to the virus. The viral nucleic acid genomes are wrapped in proteins that can be neutral, negative, or positive in charge. Therefore, the net charge of a virus depends upon the cumulative charges of the genetic material and the protein.


So the electric charge of a virus particle depends on the constitutive parts of the virus of interest; particularly if enveloped or non-enveloped; the outward-facing heads of the phospholipid bilayer membrane of an enveloped virus will carry a negative charge. 

Two references in the above paper may help with a deeper dive into the subject:


Lodish H. et al. Molecular Cell Biology (ed 4.). (W. H. Freeman, New York, 2000). (Google Scholar)
Michen B. &amp; Graule T. Isoelectric points of viruses B. J Applied Micb. 109, 388–397 (2010). (PubMed) (Google Scholar)


I couldn't find any papers on the electrical properties of novel coronavirus specifically. But looking into SARS-CoV may be suggestive of general properties. Its envelope proteins have a positive charge that help with targeting and infecting ACE2-expressing cells (https://clarivate.com/wp-content/uploads/dlm_uploads/2020/01/CORONAVIRUS-REPORT-1.30.2020.pdf).