Suppose that the laptop of Prob. 2.16 is placed in an insulating briefcase with a fully charged battery, but it does not go into 'sleep' mode, and the battery discharges as if the laptop were in use. What will happen to the battery charge over time?
1) The battery charge will decrease at a constant rate.
2) The battery charge will decrease rapidly at first and then slow down.
3) The battery charge will remain constant.
4) The battery charge will increase.