2. What is the resistance at normal room temperature of 80 m of copper wire having a diameter of 0.64 mm? (Pcopper = 1.7241 x 10-8 Q- m at 20 °C).

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Q: .A copper wire of unknown length has a diameter of 0.25 in. and a resistance of 0.28 ohm. By several…

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Q: Calculate the resistance of 87 m length of a wire having a uniform cross-sectional area of 0.25 mm²…

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Q: Find the resistance at 20°C of an annealed copper bus bar 3 m in length and 0.5 cm by 3 cm in…

A: In this question we need to find a resistance of a copper bus bar whose dimensions is given.

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A: Resistance opposes the flow of current. From Ohm's law, Resistance is  given as  Resistance of…

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Q: The conductivity of Ag is about 61.4MS/m. What is the resistance of a 2m length Ag wire having 1mm…

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Q: If the resistance of a copper wire is 50 N at 20°C, what is its resis- tance at 100°C (boiling point…

A: Given: For a copper wire, The resistance at temperature T1=20°C is R1=50 Ω Temperature at which…

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Q: A conductor of uniform cross section and 60 m long has a voltage drop of 1.2 V and a current density…

A: Given values are - Current densityJ=2.56×105Am2VoltageV=1.2VoltLengthL=60m

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Q: If we stretch a copper rod, making it 0.1% longer, how much will its resistance change? What…

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Q: The wires of our appliances insulated with a material mixed with are rubber, which has a very high…

A: Length of wire, l=2.5 m  Area of cross section A=πr2r=inner radiusr=0.52r=0.25mmr=0.25×10-3 m

Q: Find the resistance at 20°C of an annealed copper bus bar 3 m in length and 0.5 cm by 3 cm in…

A: Given, Annealed copper bus-bar L=3 mA=0.5 cm×3 cm=1.5×10-4 m2ρ=1.72×10-8 Ω-m

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A: Given values are - r=0.75mm=0.75×10-3mL=5mV=0.2VoltElectron densityn=8.10×1028m-3 Given that wire is…

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A: Resistance opposes the flow of current. R=VIFrom Ohm's law, Resistance is  given as    The S.I. unit…

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A: The solution can be achieved as follows.

Q: .1. What is the resistance of a kilometer-long piece of 14-gage (0.06408 inch diameter) copper wire?

A:

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A: Consider the area is reduced by the 30%. Then, the new area is, A-0.3A=0.7A Consider the length is…

Q: 2. What is the resistance at normal room temperature of 80 m of copper wire having a diameter of…

A:

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Q: A silver wire has conductance of 0.25 Siemens. What will be the resistance of a copper wire having a…

A:

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).