Blog

An RLC circuit consists of a 48 Ω resistor, a 200 μF capacitor and an inductor. The rms current is 2.5A when the circuit is connected to a 120 V, 60 Hz outlet. What is the inductance, in mH?

A series RLC circuit is driven by an oscillating emf. The current in the circuit is ahead of the emf. Which of the following changes to the circuit, when done independently of one another, will bring the angular frequency of the circuit closer to the resonant frequency? I. Increase the capacitance. II. Decrease the inductance. III. Increase the resistance.

Light with horizontal polarization and initial intensity I0 is incident upon two polarizing filters. The first filter has a transmission axis measured 20° from the horizontal. The intensity of the light through both filters is 30% of its initial intensity. What is the angle between the transmission axis and the horizontal for the second filter?

One of Maxwell’s equations can be written as

The figure below shows a cylindrical bar magnet and a conducting circular wire loop that is fixed in place. The plane formed by the loop is perpendicular to the y axis. Which of the following would cause an induced current in the wire? I. Moving the magnet closer to the loop II. Rotating the magnet about the y-axis. III. Rotating the magnet about the x-axis.  

Light with horizontal polarization and initial intensity I0 is incident upon two polarizing filters. The first filter has a transmission axis measured 30° from the horizontal. The intensity of the light through both filters is 20% of its initial intensity. What is the angle between the transmission axis and the horizontal for the second filter?

A laser beam shines from air upon a plastic block containing a rectangular cavity filled with liquid. The sides of the cavity are parallel with the sides of the block, as shown in the diagram. The beam travels through the plastic and into the cavity. Use the data below to calculate the index of refraction for the liquid, where all angles are measured relative to the normal: I.  The beam strikes the plastic block at 50.0° to normal. II. The beam travels at 25.0° to normal inside the plastic block. III. The beam travels at 32.0° to normal inside the liquid cavity.  

The figure below shows a cylindrical bar magnet and a conducting circular wire loop that is fixed in place. The plane formed by the loop is perpendicular to the x axis. Which of the following would cause an induced current in the wire? I. Moving the magnet closer to the loop II. Rotating the magnet about the y-axis. III. Rotating the magnet about the x-axis.  

All of the following statements are consistent with the kinetic molecular theory of gases EXCEPT:

For 3 bonus points, who’s law is P1V1 = P2V2 ?