ET 3

The capacitance of the spherical capacitor (the capacitor plates are two metallic spheres, concentric, of radius r_e and r_i, and the dielectric between the spheres has the constant permittivity ε), is:

C = (4*π*ε) *(r_e-r_i) / (r_e * r_i) [F]

C = (2*π*ε*r_e*r_i) / (r_e - r_i) [F]

C = (4*π*ε*r_e*r_i) / (r_e - r_i) [F]

C = (4*π*ε*a*b) / (a-b) [F]

The energy stored in the electric field of a capacitor is:

The electric induction of the cylindrical capacitor inside the integration surface Σ, that is also a cylinder, coaxial with the two cylindrical plates of the capacitor, having the radius a and the length d, is:

D = q / (2π * a * d) [C/m*2]

D = q / (2π * r * l) [C/m*2]

D = q / (2π * r * d) [C/m*2]

D = q / (2π * a * l) [C/m*2]

When using the node potential method, which of the affirmation is wrong?

the real currents from the circuit branches are determining by applying the Ohm's Law on each branch

l-n+1 equations will be written

in the written equations, Σlsck represents the sum of the sortcircuit injected in node k by sources from the adjacent branches to this node (k)

a reference node is chosen, preferable the N-th node

In an electric circuit, the resonance pulsation, ω:

depend only of L and C

depend of R, L, C

depend only of R

depend only of R and L

-2

The instant voltage at the terminal of an ideal condenser is given by equation:

The propagation constant of the symmetric quadripole is determined by the equation:

At the R, L, C series resonance

the total absorbed current has the maxim value

no correct option

voltage drop on the coil = voltage drop on condenser

the current has the maxim value

voltage drop on coil = voltage drop on resistance

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