If the resistivity of the material of the wire is 50 × 10-8 ohm meter, find the length of the wire. The unit for resistivity is the ohm-metre. When the length of the wire increases, the resistance also increases. Answer 22. Examples of conductive materials having less resistivity are Aluminium , Cupper , Gold etc . (a) The resistance of a conductor depends on thickness (cross sectional area of the wire), length and temperature. Resistivity is defined as the measure of the resisting power of a specified material to the … The resistivity of a material is the resistance of a wire of that material of unitlength and unit cross-sectional area. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size. This, in turn, determines the electric permittivity of the material and thus influences many other phenomena in that medium, from the capacitance of capacitors to the speed of light.. A is a paramagnetic material because its permeability is greater than unity and its susceptibility is positive. (b) Given unit of R = Ohm (Ω), A = m² and L = m Unit of Resistivity. Resistivity of a substance is numerically equal to the resistance of a rod of that substance which is 1 metre long and 1 square metre in cross section. Following is the equation relating resistivity (ρ) and resistance (R) of a conductor of length (L) and area (A). Its unit is . Question 36: Define the term resistivity and state its S.I. unit. So, resistivity is the specific resistance of a material. As per the definition, resistivity is the resistance of unit cube of the material. It is the reciprocal of electrical conductivity. Electricity of Class 10 Notes - Complete explanation and Notes of Class 10 Science chapter 1 ‘Electricity’.. (b) Resistance of a metal wire of length 5m is 100∩. Resistance of a conductor is directly proportional to its length R ∝ l if we increase the length of a wire (conductor),its resistance increases(and hence less current can pass through it) If we reduce length,resistance decreases (and hence more current can pass through it) If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. The resistivity is represented as ρ and it is directly proportional to the material resistance and length. Information and translations of electrical resistance in the most comprehensive dictionary definitions resource on the web. The resistance of a material to force penetration or bending is hardness. Silver has resistivity equal to 1.60 X 10 −8 Ω m and copper has resistivity equal to 1.62 X 10 −8 Ω m. Rubber and glass are very good insulators. Electrical resistivity is a simply accessible and informative quantity to describe the material. A material which offers very high resistance to the flow of electrons or electric current in an electric circuit is called as insulator. (2014) Answer: Resistance of a wire, R = 10 Ω Radius, r = 0.01 cm = 0.01 × 10-2 m Resistivity, S = 50 × 10-8 ohm meter Length of the wire, l = ? Resistivity: Resistivity is an intrinsic property of a material and is a measure of the opposition offered by the material to the flow of electrical current through it. These include good conductors like copper and aluminum, and some poor conductors under certain circumstances. 1.The directed rate of flow of electric charge through any cross-section of a conductor is known as electric current. Answer: (i) Element B: It has more resistivity (520 × 10 … Resistance of a … Resistivity is the intrinsic property of material of the conductor due to which it offers resistance. the resistivity of material of conductor does not depend on the geometry of the conductor. If you have any query regarding CBSE Class 10 Science Chapter 12 Electricity Multiple Choice Questions with Answers, drop a comment below and we will get back to you at the earliest. The resistivity represents the resistance of the material which has specific dimensions, i.e., the material has 1-meter length and 1 square meter area of cross section. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. For a diamagnetic material, the relative permeability lies between 0 ≤ μ r … Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Simply resistivity or Electrical resistivity is the resistance of the flow of current from one end to the other in a material. • Resistivity Resistivity is a property of the material It is how well the material conducts electricity This formula shows that the resistance will increase if p increases or the length increases. The electric susceptibility χ e of a dielectric material is a measure of how easily it polarizes in response to an electric field. If the area of cross-section of the wire is 3 × 10^7 m^2, calculate the resistivity of the material. where, n = number of charged particles constitute the current 1. Thus, electrical resistivity of a material of a conductor is defined as the resistance offered by unit length and unit cross-sectional area of a wire of the given material. Current ∝ 1/Resistance The resistance of a uniform conductor is. Insulatinng materials are infinitely resistive . 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