Below is the charging by induction procedure outlined in section 4 of the lab manual. just after each step of the procedure, determine the sign of the net charge on the electroscope vane and electroscope disk. the following steps are followed: a teflon rod is rubbed with a wool cloth so that it becomes negatively charged. an electroscope is nearby that is initially neutral on both its vane and disk. the charged rod is brought near the disk of the electroscope. the charged rod does not touch anything and no sparks jump. with the charged rod held near the disk, a person then grounds the post of the electroscope by touching it with a finger. the finger is removed from the electroscope, but the charged rod stays in place. the charged rod is moved away from the electroscope. suppose that the process were repeated, except that in step 3 a neutral acrylic rod instead of a finger is used to touch the electroscope's post, which is then removed in step 4. how would this modification affect the experiment just described? select al correct statements. the net charge on the vane would not change as a consequence of step 3. the net charge on the vane + post + disk would be zero for all steps. the net charge on the vane would change following step 3, but revert to its original value following step 4. the net charge on the vane in all steps would be exactly as it was when the experimenter used a finger. the net charge on the vane following steps 3 through 5 would have a sign opposite what it was when the experimenter used a finger.