A very long insulating cylinder of charge of radius 2.50 cm carries a uniform linear density of 15.0 nC/m. (a) Use Gauss’s law to find an expression for the electric field a short distance r from the cylinder. (b) If you put one probe of a voltmeter at the surface, how far from the surface must the other probe be placed so that the voltmeter reads 175

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.