kuruman said:
The answer gives the explanation in this case.Force and electric field are related by the formulae :F=QE .Using this you can calculate the electric field .Benjamin said:
An electric field at a point is a measure of the force that an electric charge would experience at that point in space. It is a vector quantity, meaning it has both magnitude and direction.
The electric field at a point is calculated by taking the ratio of the force exerted on a test charge placed at that point to the magnitude of the test charge. This can be expressed mathematically as E = F/q, where E is the electric field, F is the force, and q is the test charge.
The unit of measurement for electric field at a point is newtons per coulomb (N/C) in the SI system. In CGS units, the unit is dynes per statcoulomb (dyn/esu).
If there are multiple charges present, the electric field at a point is the vector sum of the individual electric fields created by each charge. This can be calculated by using the principle of superposition, which states that the total electric field at a point is equal to the sum of the individual electric fields at that point.
Yes, the electric field at a point can be negative. This simply means that the direction of the electric field is opposite to the direction of the force that would be exerted on a positive test charge at that point. The magnitude of the electric field is always positive, but its direction can vary.
