The insulator thickness on the conductor, in cables depends upon

A. voltage
B. current
C. power factor
D. reactive power

Answer: B. current

Explanation:
The dielectric strength of a material is expressed as Volts/meter and gives the maximum electric field strength that it can withstand intrinsically without breaking down. 

Therefore, the more thick the layer of insulator, the higher is the breakdown voltage. 

The dielectric constant varies slightly with increase in thickness and temperature, but is generally assumed to be constant for simplicity.

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