HANS CHRISTIAN OERSTED  (1777–1851)
Rationalised 2023-24
109
Moving Charges and
Magnetism
E = Q ˆr / (4pe0)r2
(4 1)
where ˆr  is unit vector along r,  and  the field E is a vector
field A charge q interacts with this field and experiences
a force F given by
F  =  q  E   = q Q ˆr   / (4pe0) r 2
(4 2)
As pointed out in the Chapter 1, the field E is not just
an artefact but has a physical role