Discussion
Assertion: a potential transformer works at a very small fraction of the load an ordinary transformer of its size would carry. Reason: its core is made of a material of unusually high permeability.
Answer: B
The light loading follows from the burden being only a voltmeter or relay coil, not from the core material. Good core material does help the accuracy, but it is not the reason the transformer is lightly loaded, so the two true statements are unconnected.
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