Chapter 4: Q18DQ (page 947)
What features of atomic structure determine whether an element is diamagnetic or paramagnetic? Explain.
Something is diametric or paramagnetic is dependent upon the electron configuration.
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Suppose a resistor R lies alongeach edge of a cube (12 resistors in all)with connections at the corners. Find theequivalent resistance between two diagonally opposite corners of the cube (pointsa and b in Fig. P26.84).
A horizontal rectangular surface has dimensions by and is in a uniform magnetic field that is directed at an angle of above the horizontal. What must the magnitude of the magnetic field be to produce a flux of through the surface?
An idealized ammeter is connected to a battery as shown in Fig.
E25.28. Find (a) the reading of the ammeter, (b) the current through the
resistor, (c) the terminal voltage of the battery.
Fig. E25.28.
In the circuit shown in Fig. E26.41, both capacitors are initially charged to 45.0 V. (a) How long after closing the switch S will the potential across each capacitor be reduced to 10.0 V, and (b) what will be the current at that time?
The heating element of an electric dryer is rated at 4.1 kW when connected to a 240-V line. (a) What is the current in the heating element? Is 12-gauge wire large enough to supply this current? (b) What is the resistance of the dryer’s heating element at its operating temperature? (c) At 11 cents per kWh, how much does it cost per hour to operate the dryer?
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