# 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: Fu-Kwun Hwang on February 13, 2010, 04:48:01 pm

 Title: Shape of charged beam due to deviation in angle/velocity Post by: Fu-Kwun Hwang on February 13, 2010, 04:48:01 pm A charge q with velocity v enter into a region with perpendular to magnetic field B, will move in a circular orbit. The trajectory of the beam will spread out if the bean is deviated with a small angle $\theta$ (dca in the simulation)  or with small deviation in velocity (dv)The angle $\theta$ = dca * (random() -0.5); // where random() give random number between 0-1The velocity v=V+ dv* (random() -0.5);The trjjectory for all different possible paths are shown in the following simulation. Title: Re: Shape of charged beam due to deviation in angle/velocity Post by: macfamous on February 26, 2010, 01:04:55 am may we change for the point random .. it means become positive .. Title: Re: Shape of charged beam due to deviation in angle/velocity Post by: Fu-Kwun Hwang on February 26, 2010, 10:29:26 am The above simulation assume the beam enter into the magnetic field vertically (but there is a small angle deviation).I think what you mean is that the beam might enter into the field with a angle.The code has been updated, so that you can change the incident angle with slider c, or drag the red arrow to change it direction directly.