Physics-
General
Easy

Question

The time when the voltage across the resistor drops to nearly 37% of the value just after the switch Sw is closed : (R = 100 kW, C = 1mF) is

  1. 0.15 s    
  2. 0.30 s    
  3. 0.45 s    
  4. 0.60 s    

The correct answer is: 0.15 s


    tau equals R C equals fraction numerator 3 over denominator 20 end fraction s
    voltage in capacitor rises to 63% of maximum valu
    0.63 equals open parentheses 1 minus e to the power of negative t divided by t end exponent close parentheses
    t = 0.15 s

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