The relatively high resistivity of dry skin, about 1 x 106 Ω • m, can safely limit the flow of current into deeper tissues of the body. Suppose an electrical worker places his palm on an instrument whose metal case is accidentally connected to a high voltage. The skin of the palm is about 1.5 mm thick. Estimate the area of skin on the worker’s palm that would contact a flat panel, then calculate the approximate resistance of the skin of the palm.

Q: 15. A 2.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a…

A: Solution:  Voltage across the rod, V = 18.0 V  Length of the rod, L = 2.50 m = 250 cm  Diameter, d…

Q: A coaxial cable consists of an inner conductor with radius ri = 0.25 cm and an outer radius of ro =…

A:

Q: The resistivities of copper and aluminum are 1.7 x 10-802m and 2.6 x 10-802m respectively. What…

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Q: Consider a portion of a cell membrane that has a thickness of 7.50 nm and 1.9 um x 1.9 um in area. A…

A:

Q: On three separate instances you connect each lightbulb to a battery with an emf of 12.00 V and an…

A: Given quantities: emf of the battery (V) = 12 Volts internal resistance (r) = 0.5 ohm current…

Q: . Consider a resistor network connected to a 32.0-V battery as shown. The battery has negligible…

A:

Q: A 1.30 m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a…

A: diameter= 0.500 cm  potential difference = 15.0 V Room temp. T0=20 C

Q: Consider two coaxial conducting spheres of radii a and b = 2a. Filled with a conductive material…

A: Given  P = p0(1+r/a) And  R = p*L/A

Q: A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a…

A:

Q: Some states allow the use of aluminum wire in houses in place of copper.  If you wanted the…

A: Aluminum is more resistive than copper, hence it is required bigger Aluminum wire to allow same…

Q: A ribbon of material with a rectangular cross sectional area of (0.25 mm x 1.00 mm), length 21.9 cm…

A:

Q: A wire with a resistance of 6.0 is drawn out through a die so that its new length is three times its…

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Q: A ribbon of material with a rectangular cross sectional area of (0.25 mm x 1.00 mm), length 21.9 cm…

A:

Q: If you touch the two terminals of a power supply with your two fingertips on opposite hands, the…

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Q: What diameter must a copper wire have if its resistance is to be the same as that of an equal length…

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Q: 15. A 2.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a…

A:

Q: In a discharge tube, the number of hydrogen ions 18 (i.e., protons) drifting across a cross-section…

A:

Q: Suppose that the resistance between the walls of a biological cell is 5.1 × 109 Ω. (a) What is the…

A: Required : (a) What is the current when the potential difference between the walls is 76 mV?  (b) If…

Q: 7. . Consider a resistor network connected to a 32.0-V battery as shown. The battery has negligible…

A:

Q: The circuit of Fig. 7.1 includes an immersion heater and a 6.0 Vbattery. 6.0 V A heater Fig. 7.1 (a)…

A: potential difference of the battery (V) = 6 volts potential difference required across the heater…

Q: A straight, cylindrical wire lying along the x axis has a length of 0.500 m and a diameter of 0.200…

A: Give data: The length of the wire is, L=0.5 m The diameter of the wire is, D=0.2 mm The resistivity…

Q: What is the resistance of copper wier that is 3.5m long and has a diameter of 2mm (p=1.68x10-80.m)…

A:

Q: A 1.50-m cylindrical rod of diameter 0.500 cm is connected to a power supply that maintains a…

A:

Q: Explain why R= R0 (1+αΔT)  for the temperature variation of the resistance of an object is not as…

A:

Q: The space between two metallic coaxial cylinders of length L = 0.520 m and radii a = 1.70 cm and b =…

A: (a) The resistance between the two cylinders is

Q: Q. m and 11.0 x 10 Q. m, determine the ratio of their lengths. Two wires have the same resistance…

A: Concept:- Resistance of a conductor having length L, cross-sectional area A  and resistivity ρ is…

Q: An aluminum rod has a resistance of 1.585 Q at 23.0°C. Calculate the resistance of the rod at…

A:

Q: A 560-W heating coil designed to operate from 110 V is made of Nichrome wire 0.640 mm in diameter.…

A:

Q: A resistor made of Nichrome wire is used in an application where its resistance cannot change more…

A: We have a nichrome wire which has a resistance say Ro at 20oC and it cannot change more than 1.35%…

Q: Calculate the expected resistance of a circular aluminum cable of diameter 5 mm and length 835 m.…

A: We have to calculate the expected resistance of a circular aluminum cable of diameter 5 mm and…

Q: are given a length of uniform heating wire made of a nickel–chromium–iron alloy called Nichrome; it…

A: GivenResistance, R=79.03 ΩPotential difference, V=115 V

Q: Consider a thin aluminum wire with diameter d= 6 mm The resistivity of aluminum is 2.65x10-8 Q.m.…

A: Recall R=ρL/A

Q: The temperature coefficient of resistivity for the metal gold is 0.0034 (C°)-1, and for tungsten it…

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Q: Two wires have the same resistance and radius. If the wires are made of iron and gold with…

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Q: Consider current passing through a rectangular resistor (below) in two scenarios: along the length…

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Q: Wires A and B, having equal lengths of 40.0 m and equal diameters of 2.94 mm, are connected in…

A: Given length of wire A = length of wire B = 40 m diameter of wire A = diameter of wire B = 2.94 mm…

Q: Determine the resistance of a conductor 0.60 m long, with uniform diameter of 5.0 cm and having a…

A: Given data: Length of the rod, L=0.60m Diameter d=5.0 cm=0.05m Resistivity ρ=0.005+10-3 L2 ohm.m

Q: A person standing barefoot on the ground 20 m from the point of a lightning strike experiences an…

A: The potential difference, V=300 V   The skin resistance, R=1.0 kΩ=1.0×103 Ω

Q: ) If the battery in the circuit below is 15.64V, resistor R1=349.44Ω, and resistor R2=284.01Ω, what…

A:

Q: Estimate the resistance of the vocal tract using the Poiseuille’s law, assuming it can be modelled…

A:

Q: Two wires - A and B - with circular cross-sections have identical lengths and are made of the same…

A: Standard expression for the resistance of a wire (R) is given as, R=ρLA Here, ρ is the resistivity…

Q: Consider a resistor network connected to a 32.0-V battery as shown. The battery has negligible…

A: Answer:-  Given  Potential or emf(E) = 32.0 V  Equivalent Resistance (Req) = 6.40 ohm  Resistance…

Q: If two resistors with resistances R1 and R2 are connected in parallel then the total resistance R,…

A:

Q: Calculate the MYELINATED resistance for a neuron of length 0.05 m and a radius 7 um. Give your…

A: Given that          length of the neuron 0.05m         and Radius (R) = 7μm = 7×10-6m Resistance :-…

Q: Consider a portable electric blanket that runs on a 6 V battery. If you use copper wire with a 0.75…

A: Given data: Battery voltage (V) = 6 V Wire diameter (D) = 0.75 mm = 0.75×10-3 m Power (P) = 15 W The…

Q: By using KVL, KCL, find the potential drop and the current through each resistor in the circuit…

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Q: A 100-W lightbulb has a resistance of about 12 Ω when cold (20 ∘C) and 124 Ω when on (hot). Estimate…

A: In metals, the value of the resistance changes with an increase in the value of temperature and thus…

Q: How much current will flow through a 40.0-m length of metal wire with a radius of 4.0 mm if it is…

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.