A copper wire has a resistance of 50 ohms at 25°C (room temperature). The temperature coefficient of resistance for copper is approximately 0.0039 per °C. Calculate the new resistance of the wire when it is heated to 100°C.

At 25°C, the resistance of a segment of gold wire is 59 . When the wire is placed in a liquid bath, the resistance increases to 193 N. The temperature coefficient is 0.0034 (°C) -¹ -1 at 20°C. What is the temperature of the bath? Answer in units of °C.

What is the resistance (in Ohms) of a wire made of a material with a resistivity of 4.6× 10-8Ω⋅ m if its length is 2.9 m and its diameter is 0.76 mm?

An iron wire has a resistance of 78.7. m ohm at 20 degrees Celsius. When the wire carries a current, the heat generated by the current causes the temperature of the wire to rise by 22 degrees Celsius. What is the change in the resistance of the wire? If its final current was 56.2 mA. what is your original current?

A 30.0 m long extension cord is made from two #19 gauge copper wires. (a) What is the resistance of the wire at 200C? The diameter of the copper wire is 0.912 mm.(b) If the copper wire is replaced by an Aluminium wire of the same length, what is the diameter so that the new wire has a resistance no greater than the old?

2. Page > of 3 5. Two long coaxial metal cylinders with radii a and b are separated by material of conductivity o (see figure below). The conductivity is not uniform and changes as = (s)0 where k is a constant. If the two cylinders are kept at a potential difference V, find the resistance R between the cylinders. (s)o Hint: Since the conductivity is a function of position, the charge density in the resistive medium is not zero and E does not go like 1/s. However, since the current I is steady, the same current flows across each eylindrical surface. Instead of using Gauss' Law, find E in terms of I, from Ohm's Law. acer F10 F11

A common flashlight bulb is rated at 0.34 A and 2.3 V (the values of the current and voltage under operating conditions). If the resistance of the bulb filament at room temperature (20°C) is 1.0 2, what is the temperature of the filament when the bulb is on? The temperature coefficient of resistivity is 3.7 x 10-3 K-1 for the filament material.

Aluminum wire has diameter of 3 mm. How many meters of this wire would be needed to give resistance 2 Ω if the resistivity of aluminum is 2.8 × 10−8Ω. ?.

What is the resistance (in Ohms) of a wire made of a material with a resistivity of 3.3x 10-82. m if its length is 4 m and its diameter is 0.64 mm?

How long is a tungsten wire if it has a diameter of 0.179 x 10-3m and a resistance of 2.63 k2? The resistivity of tungsten is 5.62 x 10-* 2-m. length of the wire: