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Transcript

Lesson 3 MAGNETIC FORCE ON MOVING CHARGE Announcements Magnetism HW #2 due today Modern Physics HW #6 due today HW #3 due tomorrow Physics Labs will meet this week – Diffraction lesson Physics Bowl – Next Thursday, 6th period – Bring a #2 pencil only. – Calculator will be provided AP Physics B Learning Objectives III.D.I. 1. Forces on moving charges in magnetic fields Students should understand the force experienced by a charged particle in a magnetic field, so they can: a) Calculate the magnitude and direction of the force in terms of q, v, and, B, and explain why the magnetic force can perform no work. b) Deduce the direction of a magnetic field from information about the forces experienced by charged particles moving through that field. Student Learning Objectives Students will be able to 1. Calculate the magnitude and direction of the magnetic force on a moving charge. Magnetic Force on Particles Magnetic fields cause the existence of magnetic forces. A magnetic force is exerted on a particle within a magnetic field only if – the particle has a charge. – the charged particle is moving with at least a portion of its velocity perpendicular to the magnetic field. Magnetic Force on a Charged Particle magnitude: F = qvBsin – q: charge in Coulombs – v: speed in meters/second – B: magnetic field in Tesla – : angle between v and B direction: Right Hand Rule FB = q v x B (This is a “vector cross product”) The Right Hand rule to Determine a Vector Cross Product 1. 2. 3. Align your hand along the first vector. Orient your wrist so that you can “cross” your hand into the second vector. Your thumb gives you the direction of the third vector (which is the result). Sample Problem 3.1: Calculate the magnitude force exerted on a 3.0 C charge moving north at 300,000 m/s in a magnetic field of 200 mT if the field is directed a) North. b) South. c) East. d) West. • Sample Problem: Calculate the magnitude and direction of the magnetic force. v = 300,000 m/s 34o q = 3.0C B = 200 mT