Interpret the information in the table and suggest which of these wires would have the lowest resistance. Wire Material Length m Diameter mm 1 Copper 150 0 . 5 2 Copper 100 0 . 75 3 Steel 100 0 . 75 Assume standard values of resistivity for Steel and copper.

Given: Length of the first copper wire, l 1 = 150 m . Diameter of the first copper wire, d 1 = 0 . 5 mm . Length of the second copper wire, l 2 = 100 m . Diameter of the second copper wire, d 2 = 0 . 75 mm . Length of the steel wire, l 3 = 100 m . Diameter of the steel wire, d 3 = 0 . 75 mm . Resistance of the first copper wire, r 1 = ρ l 1 d 1 = 1 . 72 × 10 - 8 × 150 0 . 5 × 10 - 3 = 516 × 10 - 5 Ω . Resistance of the second copper wire, r 2 = ρ l 2 d 2 = 1 . 72 × 10 - 8 × 100 0 . 75 × 10 - 3 = 229 . 33 × 10 - 5 Ω . Resistance of the steel wire, r 3 = ρ l 1 d 1 = 9 . 9 × 10 - 8 × 100 0 . 75 × 10 - 3 = 1320 × 10 - 5 Ω . Hence, the second copper wire will have the least resistance.

E M B I B E

MYP By Concept 4&5 Physics>Chapter 9 - Are All Our Futures Electric?>SOME SUMMATIVE PROBLEMS TO TRY

Paul Morris Solutions for Chapter: Are All Our Futures Electric?, Exercise 13: SOME SUMMATIVE PROBLEMS TO TRY

Author:Paul Morris

Paul Morris Physics Solutions for Exercise - Paul Morris Solutions for Chapter: Are All Our Futures Electric?, Exercise 13: SOME SUMMATIVE PROBLEMS TO TRY

Attempt the practice questions on Chapter 9: Are All Our Futures Electric?, Exercise 13: SOME SUMMATIVE PROBLEMS TO TRY with hints and solutions to strengthen your understanding. MYP By Concept 4&5 Physics solutions are prepared by Experienced Embibe Experts.