# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## Easy Java Simulations (2001- ) => electromagnetism => Topic started by: ahmedelshfie on June 08, 2010, 01:40:56 am

 Title: Current Loop in magnetic field (How motor works!) Post by: ahmedelshfie on June 08, 2010, 01:40:56 am This following applet is Current Loop in magnetic field (How motor works!)Created by prof Hwang Modified by AhmedOriginal project Current Loop in magnetic field (How motor works!) (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=912.0)This simulation shows a current loop in uniform magnetic field.The brown arrows show the force due to magnetic field on the loop.$\vec{F}= q \vec{v} \times \vec{B} or \vec{F}= I \int d\vec{\ell} \times \vec{B}$The magnetic field in in the +Z direction if Bz>0.Then ,torque for the loop is calculated from definition $\vec{\tau}=\vec{r}\times\vec{F}$Because the current flow in the same counter-clockwise direction.The force on the loop change sign during each helf cycle.If we current reverse direction during each helf cycle, the following device can turn into a motor.A voltage source is needed in the loop to drive the current.