Question

In: Physics

1. When a switch is closed in a RL circuit with a battery, which of the...

1. When a switch is closed in a RL circuit with a battery, which of the following statement is TRUE?

  1. Back emf is maximum in the beginning and decreases exponentially with time
  2. Back emf is zero in the beginning and increases exponentially with time
  3. Current is maximum in the beginning and decreases exponentially with time
  4. Current is zero in the beginning and increases exponentially with time

2. When an inductor is connected to an AC voltage source with Vmax= 5 V and frequency, f = 100 Hz, its inductive reactance is 49 Ohms. How would you increase the inductive reactance of the inductor in the circuit?

a.increase the frequency of the voltage source

b.increase the Vmax of the voltage source

c.decrease the Vmax of the voltage source

d.decrease the frequency of the voltage source

3. When a capacitor is connected to an AC voltage source with Vmax= 5 V and f = 100 Hz, its capacitive reactance is 35 Ohms.  How would you increase the capacitive reactance of the capacitor in the circuit?

a. increase the frequency of the voltage source

b. increase the Vmax of the voltage source

c. decrease the frequency of the voltage source

d. decrease the Vmax of the voltage source

4. In an LCR series circuit connected to a variable frequency AC voltage source, if the frequency is changed keeping the Vrms constant, why does the Irms in the circuit change? What is the condition for maximum Irms in the circuit?

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Expert Solution

genius_generous answered 2 years ago
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