InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
In the circuit elements given below, all individual resistors are identical. The resistance between P and Q in the different cases is A. a) `3R`B. b) `5R//6`C. c) `R//2`D. d) R |
|
Answer» Correct Answer - b,c,d Here the resistance are is parallel their effective resistance is `R//3` Hence answer is wrong (b) The effective resistance of first three resistance in parallel in `R//3` and next two resistance in parallel is `R//2`. Therefore the total resistance `= (R//3) + (R//2) = 5R//6` (c) The upper tweo resistance and lower two resistance are in series .The effective resistance of each arm `= 2R` These two effective resistance `= (2R xx 2R)/(2R + 2R) = R`. Now these two arms of resistance is in parallel with resistance `R` Hence effective resistance `P` and `Q` `= (R xx R)/(R + R) = (R )/(2)` (d) By symmtery the mid-joined `R` would not carry any current so effective resistance is only for `2R and 2R` parallel which will be `R` |
|