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Grade: 11
        The book says that when A and B are at 0V (ie. Earthed), the potential at point C is zero. Why is the potential at C not 5-iR? How is the output 0. (See the attached image of the and gate)
one year ago

Answers : (1)

Eshan
askIITians Faculty
1987 Points
							Dear student,

The potential at C will be zero because it is directly earthed by the contact Y shown in figure.

Truly we can write the potential at C to be V5iR but then we will use Kirchoff’s voltage law to put this value itself to 0 and find out that value of current is i=5/R, such that the potential at C comes out to be zero.
6 months ago
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