Consider an rlc series circuit with an l = 1.80 h inductor , a c = 0.900 f capacitor , and a r = 300  resistor. the source has terminal rms voltage δvrms = 60.0 v and variable angular frequency ω. a. what is the resonance angular frequency ω0 of the circuit? b. what is the rms current through the circuit at resonance, irms,0 ? c. for what two values of the angular frequency, ω1 and ω2, is the rms current half the resonance value? d. the quantity |ω1 – ω2 | defines the resonance width. calculate irms,0 and the resonance width for (i) r = 300 , (ii) 30.0 , and (iii) 3.00 . what happens to the resonance width as the resistance is decreased?

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia