Questions from Modern Physics

Q: A copper wire has a square cross section 2.3 mm

A copper wire has a square cross section 2.3 mm on a side. The wire is 4.0 m long and carries a current of 3.6 A. The density of free electrons is 8.5 × 1028/m3. Find the magnitudes of (a). the curre...

Q: A 14-gauge copper wire of diameter 1.628 mm

A 14-gauge copper wire of diameter 1.628 mm carries a current of 12.5 mA. (a). What is the potential difference across a 2.00-m length of the wire? (b). What would the potential difference in part (...

Q: A wire 6.50 m long with diameter of 2.

A wire 6.50 m long with diameter of 2.05 mm has a resistance of 0.0290 Ω. What material is the wire most likely made of?

Q: A cylindrical tungsten filament 15.0 cm long with a diameter

A cylindrical tungsten filament 15.0 cm long with a diameter of 1.00 mm is to be used in a machine for which the temperature will range from room temperature (20°C) up to 120°C....

Q: A strand of wire has resistance 5.60 µΩ. Find

A strand of wire has resistance 5.60 µΩ. Find the net resistance of 120 such strands if they are (a). placed side by side to form a cable of the same length as a single strand, and (b). connected end...

Q: A current-carrying gold wire has diameter 0.84 mm

A current-carrying gold wire has diameter 0.84 mm. The electric field in the wire is 0.49 V/m. What are (a). the current carried by the wire; (b). the potential difference between two points in the...

Q: A hollow aluminum cylinder is 2.50 m long and has

A hollow aluminum cylinder is 2.50 m long and has an inner radius of 2.75 cm and an outer radius of 4.60 cm. Treat each surface (inner, outer, and the two end faces) as an equipotential surface. At ro...

Q: Temperature coefficients of resistivity are given in Table 25.2.

Temperature coefficients of resistivity are given in Table 25.2. Table 25.2: (a). If a copper heating element is connected to a source of constant voltage, does the electrical power consumed by th...

Q: (a). What is the resistance of a Nichrome wire at

(a). What is the resistance of a Nichrome wire at 0.0°C if its resistance is 100.00 Ω at 11.5°C? (b). What is the resistance of a carbon rod at 25.8°C if its resistance is 0.0160 Ω at 0.0°C?

Q: At room temperature, what is the strength of the electric field

At room temperature, what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm) that is needed to cause a 4.50-A current to flow? (b). What field would be needed if the w...