Question

In the given circuit, it is observed that the current I is independent of the value of the resistance `R_6`. Then the resistance values must satisfy
.
A. `R_1R_2R_5 = R_3R_4R_6`
B. `1/R_5 + 1/R_6 = 1/(R_1+R_2) + 1/(R_3+R_4)`
C. `R_1R_4 = R_2R_3`
D. `R_1R_3 = R_2R_4 = R_5R_6`

Answer 1

Correct Answer - C
(c) Since current I is independent of `R_6`, it follows that the
resistance `R_1, R_2, R_3 and R_4` must from the balanced
Wheatstone bridge. `:. R_1R_4 = R_2R_3`.