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Agenda • This Week – Ch. 27-29 – Skip Lab, No Quiz • Next Week – Finish 29, No Quiz – Review • Following – Exam II on Monday (2 weeks) – April 6th [Or previous Friday if prefer] • Sections – 27.1-27.8 – 28.1-28.5 – 29.1-29.5 Magnetism • Much like electric Dipole • Combination of – North (+) – & South (-) • ALWAYS BOTH Magnetism • Lines Originate at N • Lines End at S N – More Common than E Fields – Why? S Fields & Forces • E & B (Magnetic) Fields – Same – Fields create forces – B & E Fields act on charged particles • Different? – B fields act on MOVING charges – E fields act in straight lines – B Fields act in perpendicular directions Right Hand Rule Directions for + Charge in B Field Same Idea as Rotational Motion Negative Charge = Opposite Direction “Left Hand” rule for electrons? Be consistent Or.. F = qvBsin(q), Use R.H.R. for directions Trial 1 + B Field Points Right What is the trajectory for this particle? Positive Charge, Constant Velocity to the Right… Trial 2 X X X X X X X X X X X X X X X X + X X X X X X X X X X X B Field Points Into Screen What is the trajectory for this particle? Positive Charge, Constant Velocity Right? Initial: Force points ? … Down X X X X X X X Trial 2 X X X X X X X X X X X X X X X X + X X X X X X X B Field Points Into Screen What is the trajectory for this particle? Positive Charge, Constant Velocity Right? Curves Around, now Velocity is Down Force Points? Left… X X X X X X X X X X X Trial 2 X X X X X X X X X X X X X X X X + X X X X X X X X X X X X Vo X X X X Velocity, Force & Field Always Perpendicular When Force always points inwards… Circular Motion X X Trial 3 + B Field Points Right What is the trajectory for this particle? Positive Charge, Constant Velocity Up & Right… To Solve, Separate out x & y components, treat separately Trial 3a + Just Like First Part: B Field Points Right What is the trajectory for this particle? Positive Charge, Constant Velocity to the Right… Trial 3b + Just Like 2nd Part: B Field Points Right Charge will make circle in yz plane Trial 3 + X part: + Charge travels to right Y Part: Circle in yz plane Combined: Helix: Oscillating circle traveling to right Only 3 choices: Circle, Line, Helix Trial 4 A wire is located in a field with B pointing right. Current in the wire flows upwards Is there a force on the wire, if so which direction? Break • HMWK Assistance? • Tomorrow – Finish 27 – Mathematical Problems • Wed & Fri – Finish 28, Begin 29 • Monday& Tues – Finish 29, Problems • Wed – Review • Fri – Exam