Ans : To conduct away the charge produced by friction . This charge , unless conducted away to the earth , may produce sparks causing the explosives in the truck to catch fire and explode.
Ans : Because if they cross , the electric field at the point of intersection will have two directions simultaneously , which is impossible .
Q .Why do electrostatics experiments not work well on humid days ?
Ans : Because humid air conducts electricity .
Ans : Conductors are materials in which there are a few free electrons per amom of the matter . Insulators are materials in which the electrons are not as free as in conductors .