A real gas is changed slowly from state 1 to state 2. During this process no work is done on or by the gas . This process must be :

Isovolumic

Explanation:

In thermodynamics, the process whereby A real gas is changed slowly from state 1 to state 2 and in this process there's no work done on or by the gas is called Isovolumic process.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

this would be about 43%