Two cells of e.m.f. 2.5 V and 2.0 V having internal resistance of `1Omega` and `2Omega` respectively are connected in parallel with similar poles connected together so as to send the current in the same direction through an external resistance of `2Omega`. The current in the external resistance is

Options

A. 0.87 A
B. 1.29 A
C. 1.00 A
D. 2.29 A

Answer

A

Explanation

`I=(E_(1)r_(2)+E_(2)r_(1))/(r_(1).r_(2)+R(r_(1)+r_(2)))=(1.5xx2+2xx1)/(1xx2+5( 1+2))`
`=0.29A`