24. Electric Force & Field; Gauss' Law

When a cathode ray is deflected by a magnetic field, what can you conclude about the nature of the particles in the ray?

A circuit has a peak voltage of $310V$. What is the average (mean) value of the voltage for a full cycle of a sinusoidal AC waveform?

How does wetness affect the electrical resistance of the human body?

Which of the following best describes a closed loop of conductors through which electric charges flow?

Which of the following is an important step in how an electric motor uses $B$ (magnetic field) force to produce motion?

Two small spheres, each of mass $m$ and carrying equal charges $q$, are suspended from a common point by two insulating threads of length $L$. The spheres are in equilibrium and the threads make an angle $\theta$ with the vertical. What is the magnitude of the electric force on one of the masses?

Two pairs of point charges are shown. Pair A consists of charges $q$ and $q$ separated by distance $r$. Pair B consists of charges $q$ and $-q$ separated by the same distance $r$. Which pair experiences an attractive force between the charges?

Which statement best describes the difference between an open circuit and a closed circuit in terms of electric charge flow?

When is static electricity most noticeable and why?

Two point charges, $q_a$ and $q_b$, are separated by a distance $r$. What is the magnitude of the net electric force on charge $q_a$ due to charge $q_b$?

How does the electric current produced by an $AC$ generator differ from that produced by a $DC$ generator?

In a circuit containing three resistors connected in parallel to a single voltage source, how many potentially different currents can exist in the circuit?

In the circuit shown in (figure 1), a capacitor is connected in series with a resistor and a battery. The switch has been closed for a long time prior to $t=0$, allowing the circuit to reach steady state. What is the charge stored on the capacitor just before $t=0$?

Which of the following best describes an $RC$ circuit in the context of electric charge?

For a long hollow cylindrical conductor carrying a steady current, what is the electric field inside the hollow region (but not inside the conducting material itself)?