Editor
If a $ \rm{2 \,\mu F}$ capacitor is connected, by closing a switch, to a supply of 100 volts through a $1\times10^{6}$ ohm series resistance. What will be the time constant?
Difficulty: Easy
A: 
2 seconds
B: 
3 seconds
C: 
4 seconds
D: 
7 seconds
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