# Electric Field in a Wire (Concepts)

#### Staple Gun

1. Homework Statement

A) [Directly proportional/Inversely proportional] The electric field inside the wire is ... to resistivity of the material the wire made of.

B) [Directly proportional/Inversely proportional] The electric field inside the wire is ... to the current passing through the wire.

2. Homework Equations
This is my problem, I can't seem to find any equations that relate electric field to the resistivity or current in the wire.

3. The Attempt at a Solution
My guess is that A is inversely proportional, and B is directly proportional but its just a guess.

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#### G01

Homework Helper
Gold Member
Ohm's Law comes in two forms. The form more common to intro physics is:

$$V=IR$$

The other form is the following:

$$J=\sigma E$$ where J is the current density and sigma is the conductivity (inverse of resistivity).

Can you use these equations to answer the questions?

#### Staple Gun

Thanks GO1!! Thats exactly what i was looking for. I've got the answers now :)

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