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Two cells of e.m.f. 10V & 15V are connec...

Two cells of e.m.f. 10V & 15V are connected in parallel to each other between points A&B. The cell of e.m.f. 10V is ideal but the cell of e.m.f. 15V has internal resistance `1Omega`. The equivalent e.m.f. between A and B is:

A

25/2 V

B

not defined

C

15 V

D

10 V

Text Solution

Verified by Experts

The correct Answer is:
D

For ideal ` r to 0`
`E=(10/r+15/1)/(1/r+1/1)=(10+15r)/(1+r)`
`E=10 V`
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