.electric-field1{width:167px; height:203px ;}
.example3{width:149px; height:279px ;}
.example3b{width:149px; height:279px ;}
.electric-field-formula1{width:109px; height:75px ;}
.example1{width:150px; height:100px ;}
.example2{width:199px; height:86px ;}
.electric-field2{width:103px; height:87px ;}
.electric-field3{width:103px; height:87px ;}