A suspended object A is attracted to a neutral wall. It's also attracted to a positively-charged object B. Which of the following is true about object A?
1.It is uncharged.
2.It has a negative charge.
3.It has a positive charge.
4.It may be either charged or uncharged.
Question 2
All but one of the following are necessary to create a functioning laser through stimulated emission. Which one is not necessary?
1.The system must consist of a stable gas.
2.The system must primarily be in an excited state.
3.The excited state must be metastable.
4.It must be possible for the emitted photons to stay within the system long enough to stimulate the emission of other photons.
Cystostomy. An artificial opening is made through the urinary bladder wall during this procedure. As
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