The electric field is defined as $\vec{E}=\lim\limits_{q_0 \rightarrow 0} \frac{\vec{F}}{q_0}$ where $q_0$ is the test charge and $\vec{F}$ force on $q_0$ due to the source charge. The meaning of $\lim\limits_{q_0 \rightarrow 0}$ is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → The source charge must remain at its original location and its electric field is not affected
Approaching zero test charge: The $\lim\limits_{q_0 \rightarrow 0}$ means that the test charge $q_0$ is chosen to be infinitely small. By doing this, the effect of the test charge on the source charge is minimized.