When a person is involved in a car accident, why is the likelihood of injury greater in a head-on collision as opposed to being hit from behind? Answer using the concepts of relative velocity, momentum, and average force.
Sources of Magnetic Field Magnetic field of a circular current loop • The Biot Savart law gives B = 0Ia /2(x + a )3/on the x axis of the loop. • At the center of N loops, the field on the axis is B x 0NI/2a. Copyright © 2012 Pearson Education Inc. Magnetic field of a coil • direction of the field using the right-hand rule. Ampere’s law (special case) Copyright © 2012 Pearson Education Inc. Ampere’s law (general statement) Copyright © 2012 Pearson Education Inc. Magnetic fields of long conductors Copyright © 2012 Pearson Education Inc. Field of a solenoid • A solenoid consists of a helical winding of wire on a cylinder. B=