Answer: J = sigma x E.
- A J = E/sigma
- B J = sigma x E
- C J = sigma x E<sup>2</sup>
- D J = E<sup>2</sup>/sigma
Correct answer: B. J = sigma x E
Explanation: J = sigma x E (vector form of Ohm's law). sigma = 1/rho (conductivity is inverse of resistivity).
In series, the same current flows through both resistors; in parallel, the current splits between branches and the voltage across each resistor is the same.
Concept context
Ohm's law, resistors, Kirchhoff's laws, Wheatstone bridge, and cells.