5. The following circuit can be used as part of a loudspeaker crossover network. These networks can be pictured as frequency sensitive voltage dividers. This circuit allows low frequency tones to go into the low frequency transducer labeled here as "Loudspeaker", a.k.a. woofer. The crossover frequency is the frequency f at which the reactance magnitude equals the woofer's resistance.

If the woofer resistance is: R = 4p W and L = 1 mH.

5a) Calculate the crossover frequency

Answer (1 pt):

 

5b) Find P F, S, and Q at 2000 Hz for an harmonic wave (i.e. sinusoidal signal) with a peak amplitude of 1V.

Answer (4 pts):

The voltage across a 5 μF capacitor is known to be Vfort≥0 , where t is in seconds.

Part B

Find the power at the terminals of the capacitor when t = 185 μs .

Part D

Find the energy stored in the capacitor at t = 185 μs

Part E

Find the time when the maximum energy stored in the capacitor occurs.

Part F

Find the maximum energy stored in the capacitor

First Part

In the toroidal coil of the figure below the outer radius is equal to 5cm and the
internal with 4cm. The core is made of ferromagnetic material, the
coil has 400 + 13 coils and is leaked by a current of 0.3 A. The relative magnetic
permeability of ferromagnetic material is 2000.
1. Calculate the magnetic flux Φ in the core.
2. Calculate magnetic induction B.

Second Part

The toroidal coil itself is made of ferromagnetic material M1929, and the coil
it has 400 + 13 spirals.
1. How much current will need to pass through the coil in order to grow
magnetic flux equal to 0.12 mWb.
2. How much current will need to pass through the coil in order to grow
magnetic flux equal to 0.06 mWb.

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