24. Electric Force & Field; Gauss' Law

Electric Charge

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Suppose three point charges are arranged at the vertices of an equilateral triangle. If each charge has magnitude $q$ and the side length of the triangle is $a$ , what is the magnitude of the net electric force on one of the charges due to the other two?
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A circuit contains a resistor and a capacitor in series with a battery. At time $t = 0$ s, the current is $i_{0}$ . At what time in $μ s$ will the current decrease to $\frac{1}{2} i_{0}$ ?
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When a cathode ray is deflected by a magnetic field, what can you conclude about the nature of the particles in the ray?
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A circuit has a peak voltage of $310 V$ . What is the average (mean) value of the voltage for a full cycle of a sinusoidal AC waveform?
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How does wetness affect the electrical resistance of the human body?
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Which of the following best describes a closed loop of conductors through which electric charges flow?
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Which of the following is an important step in how an electric motor uses $B$ (magnetic field) force to produce motion?
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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 $θ$ with the vertical. What is the magnitude of the electric force on one of the masses?
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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?
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Which statement best describes the difference between an open circuit and a closed circuit in terms of electric charge flow?
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When is static electricity most noticeable and why?
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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 $q_{b}$ ?
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How does the electric current produced by an $A C$ generator differ from that produced by a $D C$ generator?
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In a circuit containing three resistors connected in parallel to a single voltage source, how many potentially different currents can exist in the circuit?
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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 $t = 0$ ?
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