The minimum dielectric stress in a cable is at
Bedding
Armour
Conductor surface
Lead sheath
Lead sheath
The minimum dielectric stress in a cable is at dead sheath. The potential gradient at a point ‘X’ meter
from the centre of the cable 
Dielectric stress is minimum for maximum value of 'X' . So, that at the lead sheath the dielectric stress is
minimum.
Minimum potential gradient is 
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