ET 2
The internal resistance of an ideal voltage source has the value equal with
Infinite
Any value
The source value
Zero
In the R, L, C parallel circuit we know R = 5[Ω], L = 10[mH] and C = 1[μF]. The resonance frequency, fr, of the circuit will be:
Fr = 1592 [Hz]
Fr = 15 [kHz]
Fr = 150 [Hz]
Fr = 628 [mHz]
In using the analogy between the electrostatic field and the electro-kinetic field which of the analogies is incorrect:
D
A
B
C
The resistance of the spherical capacitor (the capacitor plates are two metallic spheres, concentric, of external radius a and internal radius b, and the dielectric between the spheres has the constant permitivitty ε and constant resistivity ϝ), is:
R = ϝ / (4π ) * (a-b) / (r_i*r_e), [Ω]
R = ϝ / (4π ) * (a-b) / (a*b), [Ω]
R = ϝε / (4π ) * (a-b) / (a*b), [Ω]
R = ϝ / (4π ) * (r_e-r_i) / (r_i*r_e), [Ω]
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