1.

100 cells each of emf 5V and internal resistance 1 Ω are to be arranged so as to produce maximum current in a 25 Ω resistance. Each row contains equal number of cells. The number of rows should be(a) 2  (b) 4  (c) 5  (d) 100

Answer»

Correct option (a) 2 

Explanation:

Total no. of cells, = mn = 100

Current will be maximum when R = nr/m; 25 = n x 1/m

⇒ n = 25 m 

From equation (i) and (ii)

n = 50 and m = 2



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