Question

In the equation AB = C, A is the current density, C is the electric field, Then B is(a) resistivity(b) conductivity(c) potential difference(d) resistance

Answer 1

B is the answer that is conductivity

Answer 2

Answer:

A) Resistivity

Explanation:

The current density inside any conductor is defined as the vector quantity that has a magnitude equal to the current through infinitesimal area at the point, where area is normal to the direction of flow of current and whose direction is along the direction of current at that point.

Thus, If An is small area normal to current, then:

Current density = J = I/an

Thus, for any given conductor of uniform cross-section A of length l, the electrical resistance R is directly proportional to length I and inversely proportional to cross-sectional area A, thus B will be the resistivity.