wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The potential difference between the points P and Q in the given circuit is .

A
0.44V
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
1.55V
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
2.66V
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
1.33V
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B 1.55V
Cells are in parallel but mind the polarity of the cells and modify the formulae accordingly.
Cells are in parallel. We can use the direct formula. For two cells in parallel, we can apply
E=E1r2+E2r1r1+r2r=r2r1r1+r2
Let’s first find the equivalent cell for first two rows and then evaluate the equivalent combination considering the third.
For first two rows of cell it’s fairly simple as you just need to apply the above formula as it is.
Let’s do that:
E=5×1+4×11+1E=4.5Vr=11+1=0.5Ω
Now this cell is again in parallel with the third given cell. But notice carefully that the third cell has the reverse polarity. Nothing to be scared of. You very well know that a “minus” sign is going to get things done pretty easily.
Eeq=Er3E3rr3+r=4.5×12×0.51+0.5=1.55Vreq=r3rr3+r=1×0.51+0.5=0.33Ω
So the potential difference is 1.55 V.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Cell and Cell Combinations
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon