Question

Question:Match the following for the current distribution throughout the conductor cross section:

(i) For dc (a) uniform

(ii) For ac (b) nonuniform

Short answer

Answer

(i) The correct match for (i) is (b)non uniform

(ii) The correct match for (ii) is (a)uniform

Step-by-step solution

Explain ac resistance dc resistance 

The distribution of ac current is non uniform as it dependent n frequency,

The distribution of dc current is uniform throughout the conductor as it remains constant throughout the conduction.

Explanation for (i) 

(i)

With the increase in frequency, the current tends to achieve higher density on the outer surface of the solid conductor.

Whereas this process called skin effect lead to smaller current density at the inner conductor

Therefore correct option is (b)

Explanation for (ii)

(ii)

The DC resistance can be easily calculated by emf generated between the conductors (inner and outer) of a line, divided by current flowing through them.

Also, it is independent of the dimensions of the conductor.

Hence, it is uniform in nature.

Therefore correct option is (a).