Question

Which of the following are voltage sources?
A. Ohm's law
B. resistance
C. electric charge
D. batteries and wall sockets

Answer 1

err ... The voltage is defined by the electric potential difference. But ... A source of voltage are the batteries and wall sockets. so D. Basic bro

Answer 2

electric charge creates electric field around it,which in turn creates potential diff b/w any points.. so C is also true... n D is obviously true.
There will be potential diff between plates at A n B,therefore electron will move frm higher pot. to lower,hence resullting in current flow, although this will stop after sometime when the potential of both the plates will become equal.(yet its nt a continuous voltage source )