The tape in the tape lab was charged by because 1. Adduction... positively charged piece of tape and one negatively charged piece of tape were near each other but not touching.

2. Conduction I started with 1 neutral tape and 1 negatively charged desk and ended with 1 neutral desk and 1 positively charged tape.

3. Friction ... I started with 2 neutral charges and ended with a negative charge on the tape and a positive charge on the desk.

4. lnduction...the 2 neutral pieces of tape were near each other but not touching, so both became negative.

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons