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The `n` rows each containing `m` cells in series are joined parallel. Maximum current is taken from this combination across an 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

A

m=8, n=3

B

m=6, n=4

C

m=12, n=2

D

m=2, n= 12

Text Solution

Verified by Experts

The correct Answer is:
C
`n to` rows, m `to` cell in each now
`R = 3Omega, m xx n = 24`
`R = (mr)/n rArr 3 = (m xx 0.5)/n rArr 3n = 0.5 m rArr m = 6n`
`6n xx n = 24 rArr n =2, m=12`
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