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Chapter 4: Q22DQ (page 841)
A fuse is a device designed to break a circuit, usually by melting when the current exceeds a certain value. What characteristics should the material of the fuse have?
The materials used in a fuse should have high resistance and low melting point.
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Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. These cyclotrons typically accelerate (the hydride ion, which has one proton and two electrons) to an energy of This ion has a mass very close to that of a proton because the electron mass is negligible about of the proton’s mass. A typical magnetic field in such cyclotrons is .(a) What is the speed of a ? (b) If the has energy what is the radius of this ion’s circulator orbit?
A cylindrical rod has resistivity . If we triple its length and diameter, what is its resistivity in terms ofrole="math" localid="1655715631515" .
An electrical conductor designed to carry large currents has a circular cross section 2.50 mm in diameter and is 14.0 m long. The resistance between its ends is . (a) What is the resistivity of the material? (b) If the electric-field magnitude in the conductor is 1.28 V/m, what is the total current? (c) If the material has free electrons per cubic meter, find the average drift speed under the conditions of part (b).
When switch Sin Fig. E25.29 is open, the voltmeter V reads 3.08 V. When the switch is closed, the voltmeter reading drops to 2.97 V, and the ammeter A reads 1.65 A. Find the emf, the internal resistance of the battery, and the circuit resistance R. Assume that the two meters are ideal, so they don’t affect the circuit.
Fig. E25.29.
The capacity of a storage battery, such as those used in automobile electrical systems, is rated in ampere-hours .A battery can supply a current offor or for and so on. (a) What total energy can be supplied by a battery if its internal resistance is negligible? (b) What volume (in litres) of gasoline has a total heat of combustion equal to the energy obtained in part (a)? (See Section 17.6; the density of gasoline is .) (c) If a generator with an average electrical power output ofrole="math" localid="1655719210000" is connected to the battery, how much time will be required for it to charge the battery fully?
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