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Chapter 21: Q14CQ (page 771)
Explain which battery is doing the charging and which is being charged in Figure 21.45.
is charged, is doing the charging.
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(a) What is the unknownin a potentiometer that balances whenis , and balances when role="math" localid="1656393398590" is for a standard 3.000-V emf? (b) The sameis placed in the same potentiometer, which now balances when is for a standard emf of 3.100-V . At what resistancewill the potentiometer balance?
A \(160 - \mu F\)capacitor charged to \(450\;V\)is discharged through a \(31.2 - k\Omega \)resistor. (a) Find the time constant.(b) Calculate the temperature increase of the resistor, given that its mass is \(2.50\;g\)and its specific heat is \(1.67\frac{{kJ}}{{kg{ \cdot ^\circ }C}}\), noting that most of the thermal energy is retained in the short time of the discharge. (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?
Aresistor, an unchargedcapacitor, and anemf are connected in series. (a) What is the initial current? (b) What is the RC time constant? (c) What is the current after one time constant? (d) What is the voltage on the capacitor after one time constant?
When an unknown resistanceis placed in a Wheatstone bridge, it is possible to balance the bridge by adjusting to be . What is if?
Why can a null measurement be more accurate than one using standard voltmeters and ammeters? What factors limit the accuracy of null measurements?
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