Understanding Magnetic Fields and Forces in Physics
Explore the concepts of magnetic fields, Lorentz force, and the behavior of charged particles in varying magnetic environments through interactive images and scenarios. Learn about the paths of protons in uniform electric and magnetic fields, as well as the interaction of current-carrying wire loops with magnetic forces. Dive into the fascinating world of magnetism and its applications in physics.
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Presentation Transcript
Magnetic fields, B - Features - Force - Sources
A proton (q=+e) is released from rest in a uniform E and uniform B. E points up, B points into the page. Which of the paths will the proton initially follow? C D A B E. It will remain stationary (To think about: what happens after longer times?)
A proton (speed v) enters a region of uniform B. v makes an angle with B. What is the subsequent path of the proton? 5.3 A) Helical B) Straight line C) Circular motion, page. (plane of circle is B) D) Circular motion page. (plane of circle at angle w.r.t. B) E) Impossible. v should always be B
5.4 A wire loop in a B field has a current I. The B-field is localized, it s only in the hatched region, roughly zero elsewhere. Which way is I flowing to hold the mass in place? B (into page, uniform) L A)CW B) CCW C) You cannot levitate like this! I m
5.4 A wire loop in a B field has a current I. The mass is "levitated" by the magnetic force Fmag=ILB. If you increase the current , does the magnetic force do positive work on the mass? B (into page, uniform) A)Yes B) No L I m
