What is electric field strength at any point and electric potential at a point be zero while electric field is not zero?
I think you mean at every point of the charged sample. To simplify, let's take a charged disk. Charge and potential are assumed to be maximal at the center of disk t. In the direction normal to the disk, the field is zero at the center and reverses on both sides. In the parallel direction, the field is maximal at the edge of the disk.
Are you interested in measuring the surface potential of a grain of rice and how it varies with the type of rice? You'd be the first to describe a plant species by a physical-chemical law.
Yes, electric potential is zero at all points on equatorial line of electric dipole, while electric field strength is not zero.The strength of an electric field E at any point may be defined as the electric, or Coulomb, force F exerted per unit positive electric charge q at that point, or simply E = F/q. The electric field is defined at each point in space as the force per unit charge that would be experienced by a vanishingly small positive test charge if held stationary at that point. The electric field strength at distant point, P, due to a point charge, +q, located at the origin, is 100 μ V/m. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose center is at the origin, then the electric field strength at the point, P, outside the sphere, becomes. We define the electric field at a point as the force per unit charge. Where F is the Coulomb force exerted by a charge on a test charge q. The units of the electric field are newtons per coulomb: N·C−1. The field is strongest where the lines are most closely spaced. The electric field lines converge toward charge 1 and away from 2, which means charge 1 is negative and charge 2 is positive.If the electric potential at a certain point is zero, then the electric field at the same point is also zero. No, it is not necessary. As an example electric field inside a hollow charged spherical shell is zero but potential at the point is same as that on the surface of shell and inside a hollow charged metallic conductor, the electric field is Zero, but electric potential is finite. Electric potential is a scalar quantity. The potential at some point due to several point charges is the sum of the potentials due to each charge separately. Electric field lines always point towards regions of lower potential. The value of the electric potential can be chosen to be zero at any convenient point.
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