Static Electricity

Introduction to electric field :- when an electric charge ‘q₀’ is brought near to another charge ‘q’, then they experience a force which may be attractive or repulsive. This force on charge ‘q₀’ due to charge ‘q’ is confined in a certain region. So
“The region or space around the charge in which the electrostatic force of attraction or repulsion due to charge can be experienced by any other charge is known as electric field.”
Electric field Intensity :- The electric field intensity (or strength) at a point in an electric field is the force experienced by a unit positive charge (or a test charge q₀) placed at that point. Mathematically it is denoted by E. So electric field = force / unit +ve (test) charge
i.e

<img src=”https://cdn.mathpix.com/snip/images/peKk4FN3MMfEW90Vwne94ZYIeH8E_A0DNWt-Gwt9XHs.original.fullsize.png”>

\vec{E}=\frac{\vec{F}}{q_0}