The `n` rows each containinig `m` cells in series are joined parallel. Maximum current is taken from this combination across jan external resistance of `3 Omega` resistance. If the total number of cells used are 24 and internal resistance of each cell is `0.5 Omega` then

Options

A. m = 8, n = 3
B. m = 6, a = 4
C. m = 12, n = 2
D. m = 2, n = 12

Answer

D

Explanation

Total cells `=m xx n=24" "(i)`
For maximum current in the circuit
`R=(n r)/(m)`
`rArr 3=(n)/(m)xx (1)/(2) rArr n=6 m " " (ii)`
On solving equation (i) & (ii)
we get
`m=2, n=12`