Correct option is B
Thevenin's Theorem states that any linear, bilateral network of voltage sources and resistances can be replaced by a single voltage source Vth (Thevenin voltage) in series with a single resistance Rth (Thevenin resistance).
Norton's Theorem states that the same network can also be replaced by a single current source IN (Norton current) in parallel with a single resistance RN (Norton resistance).
The relationship between the Thevenin and Norton equivalents is:
Thevenin resistance Rth is equal to Norton resistance RN.
Thevenin voltage Vth is related to Norton current IN by Vth =IN RN.
Since both resistances are derived from the same original network and represent the same aspect of the circuit's impedance, they are equal:
Rth=RN
Therefore, the correct answer is (b) Norton resistance = Thevenin resistance
