An alternating emf source with a variable frequency fd is connected in series with a 50.0 resistor and a 20.0 mF capacitor. The emf amplitude is 12.0 V. (a) Draw a phasor diagram for phasor VR (the potential across the resistor) and phasor VC (the potential across the capacitor). (b) At what driving frequency fd do the two phasors have the same length? At that driving frequency, what are (c) the phase angle in degrees, (d) the angular speed at which the phasors rotate, and (e) the current amplitude?

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Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.