I'm doing A-Level physics and I've been answering questions on Young's Modulus. I need to be able to explain why a long, thin wire is used when measuring the Young's Modulus of a material. I can give an explanation of why stress due to the wire being thinner is greater but I don't know why stress is greater in a thinner wire. Any help in understanding this would be much appreciated. Thanks for taking your time to read this.