Solenoid

How many loops are necessary to create a solenoid with a uniform magnetic field?   Build a solenoid by adding current loops to the simulation. You can measure the magnetic field by click-dragging the mouse and observing the yellow message box. You can also superimpose field lines by double-clicking inside the animation.

Script Example

<script language="JavaScript"> 
x=-2;  // position of first loop

// reset button
function reset(){
   document.BField.setDefault();
   document.BField.setShowFieldLineOnDoubleClick(true);
   document.BField.setShowFieldVectors(true); 
   x=-2;  
}

// add loop button
function add(){
   document.BField.setShowBOnDrag(true);
   document.BField.setShowFieldLineOnDoubleClick(true);
   c1=document.BField.addCoil(x,0,1);
   x=x+0.2;
   document.BField.setDrag(c1,true);
   document.BField.setOptionDrag(c1,true);
   document.BField.setRadius(c1,1);   
}
</script>