Question

A positive point charge (+q)is kept near a charge plata. 1. Draw the electric field lines of force from point charge to the plate.
2. Derive an expression for the electric field intensity at the surface of the plate.​

Answer 1

Answer:Representation of electric field : The electric field due to a positive charge (+q) is represented as in fig.

Electric field due to a point charge : Consider a point charge +q placed at the origin O of the coordinate frame. Let q0 be any test charge placed at P.

According to Coulomb's Law, force on the test charge q0 due to charge q is given by

F→=14π∈0qq0r2rˆ

where rˆ is a unit vector along OP. If E→ be the electric field at point P then

Representation of electric field : The electric field due to a positive charge (+q) is represented as in fig.

Electric field due to a point charge : Consider a point charge +q placed at the origin O of the coordinate frame. Let q0 be any test charge placed at P.

According to Coulomb's Law, force on the test charge q0 due to charge q is given by

F→=14π∈0qq0r2rˆ

where rˆ is a unit vector along OP. If E→ be the electric field at point P then

E→=Fq0=14π∈01r2rˆ

E→=14π∈0qr3.r→ [∵rˆ=r→|r|]

∴ The magnitude of the electric field at point P is given by

E=14π∈0.qr2

The electric field due to a point charge is spherical symmet

Explanation: