Define potential gradient. Give its SI unit?

Define power of a lens. Write its S.I. unit

Potential is a scalar quantity. Potential gradient is a vector quantity Negative of potential gradient is another vector quantity. It is

Define electric power. What is its Si unit?

What is conductivity? Give its SI unit

When a charged particle moves in an electric field, work is done on the particle:- Pick out a vector quantity for the following. (a)electric potential (b)electric potential gradient (c)electric potential energy. (d)electric flux

Assertion: A potentiometer of longer length is used for accurate measurement Reason: The potential gradient for a potentiometer of longer length with a given source of e.m.f becomes small

Define surface energy. What is its SI unit?