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Chapter 4: Q1DQ (page 744)
A rubber balloon has a single point charge in its interior. Does the electric flux through the balloon depend on whether or not it is fully inflated? Explain your reasoning.
No, the electric flux does not depend on whether the balloon is fully inflated or not.
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Questions: A conductor that carries a net charge has a hollow, empty cavity in its interior. Does the potential vary from point to point within the material of the conductor? What about within the cavity? How does the potential inside the cavity compare to the potential within the material of the conductor?
Question: The circuit shown in Fig. P26.74, called a Wheatstone Bridge, is used to determine the value of an unknown resistor X by comparison with three resistors M, N, and P whose resistances can be varied. For each setting, the resistance of each resistor is precisely known. With switches S1 and S2 closed, these resistors are varied until the current in the galvanometer G is zero; the bridge is then said to be balanced. (a) Show that under this condition the unknown resistance is given by X = MP/N. (This method permits very high precision in comparing resistors.) (b) If galvanometer G shows zero deflection when M = 850.0 鈩�, N = 15.00 鈩�, and P = 33.48 鈩�, what is the unknown resistance X?
In the circuit shown in Fig. E26.18,(a) What is the potential difference Vab between points a and b when the switch S is open and when S is closed? (b) For each resistor, calculate the current through the resistor with S open and with S closed. For each resistor, does the current increase or decrease when S is closed?
Question: Good conductors of electricity, such as metals, are typically good conductors of heat; insulators, such as wood, are typically poor conductors of heat. Explain why there is a relationship between conduction of electricity and conduction of heat in these materials.
When two point charges of equal mass and charge arereleased on a frictionless table, each has an initial acceleration(magnitude) a0. If instead you keep one fixed and release the otherone, what will be its initial acceleration: or ? Explain.
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