JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

To get maximum current through a resistance of

2.5\, \Omega

, one can use

m

rows of cells, each row having

n

cells. The internal resistance of each cell is

0.5 \, \Omega

. The values of

n

and

m

, if the total number of cells is 45, are

View answer and explanation

Correct option: A

m=3, n=15

Option A (

m=3, n=15

) is correct because it satisfies the condition for maximum current, where the external resistance equals the total internal resistance of the cells.

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\mathrm{\rho }

3\,\,{\mathrm{m}^3}

3\,\,\mathrm{\Omega }

4.7\,\, \times \,\,{10^6}\,\,\mathrm{\Omega }\,\, \pm \,\,5\,\,\%

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