Two identical cells connected in series send 10 A current through a 5Ω resistor. When they are connected in parallel, they send 8 A current through the same resistance, the internal resistance of each cell is

Question

Two identical cells connected in series send 10 A current through a 5Ω resistor. When they are connected in parallel, they send 8 A current through the same resistance, the internal resistance of each cell is (A) Zero (B) 2.5Ω (C) 10 Ω (D) 15 Ω

Tardigrade Admin · Accepted Answer

For series combination 2 xi = (5 + 2r) 10 . For parallel combination xi = ( 5 + (r/2) )8

Q. Two identical cells connected in series send $10 A$ current through a $5Ω$ resistor. When they are connected in parallel, they send $8 A$ current through the same resistance, the internal resistance of each cell is

Zero

2.5 $Ω$

10 $Ω$

15 $Ω$

For series combination $2 ξ = (5 + 2 r) 10$ . For parallel combination $ξ = (5 + \frac{r}{2}) 8$

Q. Two identical cells connected in series send 10A current through a 5Ω resistor. When they are connected in parallel, they send 8A current through the same resistance, the internal resistance of each cell is

Zero

2.5Ω

10 Ω

15 Ω

For series combination 2ξ=(5+2r)10 . For parallel combination ξ=(5+2r​)8

Q. Two identical cells connected in series send $10 A$ current through a $5Ω$ resistor. When they are connected in parallel, they send $8 A$ current through the same resistance, the internal resistance of each cell is

2.5 $Ω$

10 $Ω$

15 $Ω$

For series combination $2 ξ = (5 + 2 r) 10$ . For parallel combination $ξ = (5 + \frac{r}{2}) 8$