hw0 - Phys 3327 Fall 10 HW 0 Due Monday 08/30/10 in lecture...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
HW 0 Due Monday 08/30/10 in lecture Homework 0 Warm-ups Ex 1.1: Thomson’s Jumping Ring In class you saw a demonstration of ‘Thomson’s jumping ring’: A conducting ring placed around the upper half of a solenoid was propelled upwards once the solenoid was connected to AC power (see ±gure with coordinates labelled). a) Draw the magnetic ±elds lines produced by the solenoid when the current in the solenoid is non-zero. b) Let the magnetic ±eld be B ( r, z, t ) = B ( r, z ) sin( ωt ) and assume the ring has radius a and zero resistance. Use Faraday’s law and the Lorentz force law to derive an expression for the force acting on the ring at any time t (you need not ±nd B ( r, z ) explicitly). Deduce that there is always an upwards force on the ring. c) Extra Challenge: What happens if the ring has a non-zero resistance? Hint: Divide the magnetic Feld into radial and axial components. Keep in mind that the ring has an inductance! Ex 1.2: Coaxial cable
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

hw0 - Phys 3327 Fall 10 HW 0 Due Monday 08/30/10 in lecture...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online