A current, i(t) = 50 cos(100πt) enters the input terminal of an electric device. What is the current at t = 60 ms?      50 mA   10 mA   500 mA   5 mA

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A current, i(t) = 50 cos(100πt) enters the input terminal of an electric device.
What is the current at t = 60 ms?
  
 
50 mA
 
10 mA


 
500 mA
 
5 mA

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