A copper wire has a diameter 0.5 mm and resistivity of 1.6 X 10-8 Ωm. Wood is considered as a high-insulator but this varies depending upon the amount of moisture present in it. Wire A has length l and radius r, while wire B has length 2l and radius 2r. Resistivity of a conductor is defined as resistance of the conductor of unit length and unit area of cross-section. NCERT Solutions for Class 10 Science Electricity. Relationship Between Resistivity ρ and Conductivity s. Resistivity is a measure of how well a material is at resisting the flow of current just like a frictional force while conductivity is a measure of how well, a conductor allows the flow of current through it just like a water pipe. The resistivity of sample C is of the order of an alloy, so sample C is suitable for heating elements of electrical appliances. The unit of resistivity is ohm meter. Conductivity is a measure of how well a material conducts an electric current. The lower the resistivity, the more readily the material permits the flow of electric charge. Assume that the cylindrical pipe is made of a material of resistivity 2 x 10-8 ohm m. The resistivity of copper is around 1.7 x 10-8 ohm metre (or 17. nΩm), although figures will vary slightly according to the grade of the copper Materials like copper and even aluminium provide low levels of resistivity and this makes them ideal for use as electrical wires and cables - … ... Q6. If the answer is not available please wait for a while and a community member will probably answer this soon. Find the resistance of a hollow cylindrical pipe of length 1m whose inner and outer radii are 10cm and 20 cm respectively. The other differences between them are explained below in the comparison chart. What Is Resistivity where ρ (rho) is called resistivity of the material of conductor. Electric conductivity may be represented by the Greek letter σ (sigma), κ (kappa), or γ (gamma). are solved by group of students and teacher of Class 10, which is also the largest student community of Class 10. If, l = 1 m and a = 1 m2 Then R = ρ …. All the resistivity values for various materials can be found in a table. Question 5. How much does the resistance change if the diameter is doubled? At 20 0 C the resistivity value for silver is 1.59×10-8, for copper 1.68×10-8. Electrical conductivity is the reciprocal quantity of resistivity. The Questions and Answers of What is electrical resistivity ? Filed Under: Class 10, Electricity Tagged With: area of cross section, cause of resistance, connecting wires, filament of an electric bulb, length, nichrome, resistance, resistivity. Resistivity is the resistance per unit length and cross-sectional area. What will be the length of this wire to make its resistance 10 Ω? At the other extreme, electrical insulators have resistivities in the range 10 1 2 to 10 2 0 ohm-metres. Q7. (ii) Thus, if we take 1 metre long piece of a substance having … It is the property of the material that opposes the flow of charge or the flow of electric current. The resistivity of an exceedingly good electrical conductor, such as hard-drawn copper, at 20° C (68° F) is 1.77 × 10-8 ohm-metre, or 1.77 × 10-6 ohm-centimetre. 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