Discussion
The loop test used with underground cables work on the principle of:
Answer: C
The loop test, such as the Murray loop test, is used to locate a fault in an underground cable. The faulty cable and a sound cable are joined to form a loop, and a bridge with two known ratio arms and the cable's resistance is balanced, so the test works on the principle of the Wheatstone bridge. Faraday's law is the basis of induced voltage, magnetic attraction and repulsion is the basis of moving-iron instruments, and hysteresis is a property of magnetic materials. The answer is Wheatstone bridge, option (C).
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