### Electric Charges and Fields

goals
Charge $q_1 = + 2.0 n C$ is on $Y-$ axis at $y = +2 cm$ and charge $q_2 = -2.0 nC$ is on $Y-$ axis at $y = -2 cm$ . The force on a test charge $q_0 = 1 \mu C$ placed on $X-$ axis at $x= 2 cm$ is :
A charge $Q$ is uniformly distributed over a large plastic plate. The electric field at a point $P$ close to the centre of the plate is $10 V m^{-1}$ . If the plastic plate is replaced by a copper plate of the same geometrical dimensions and carrying the same charge $Q$ , the electric field at the point $P$ will become.

Three charges -$q_{1}$, +$q_{2}$ and -$q_{3}$ are placed as shown in the figure. The x-component of the force on -$q_{1}$ is proportional to:

Draw the graphs $E \quad Vs \quad r$ in the following case :
A point charge $q$ is placed at  the origin. How does the electric field due to the charge vary with distance $r$ from the origin?
The force between two charges 0.06 m apart is $5\ N$. If each charge is moved towards the other by $0.01\ m$, then the force between them will become