A Physics Instructor in an Anteroom Charges an Electrostatic Generator

Multiple Choice

A physics instructor in an anteroom charges an electrostatic generator to 25 *C, then carries it into the lecture hall.The net electric flux through the lecture hall walls is:

A) 0 N.m²/C
B) 25 * 10^-6 N.m²/C
C) 2.2 *10⁵ N.m²/C
D) 2.8 *10⁶ N.m²/C
E) can't tell unless the lecture hall dimensions are given