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B
An a.c. ground
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C
a virtual ground
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D
an ordinary ground
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Solution
The correct option is C
a virtual ground
Virtual ground is a circuit element that is not directly connected to the ground but is held at a reference voltage. This reference voltage does not have to be the same voltage as the ground.
The important point is that current flows from one point of the circuit to the ground and then back into the circuit. As a result, the current cannot flow to the ground via a virtual ground.
All other grounds, whether mechanical A.C. or ordinary ground, serves as a reference point against which other voltages can be measured.