You have four point charges 2q, q, -q, -2q. if possible describe how you would place a closed surface that encloses at least the charge 2q ( and perhaps other charges) and through which the net electric flux is a) 0 b) =3q/ɛ c)-2q/ɛ

CBSE Grade 12 Physics

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current

What does si stand for,when referring to a system of measurement