In the following diagram the wheat stone bridge is balanced when we interchange the resistances of
A$4\,\Omega $ and $6\,\Omega $
B$18\,\Omega $ and $12\,\Omega $
C$4\,\Omega $ and $18\,\Omega $
D$18\,\Omega $ and $6\,\Omega $
Medium
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D$18\,\Omega $ and $6\,\Omega $
d
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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 $. What are the values of $n$ and $m$ if the total number of cells is $45$ ?
The storage battery of a car has an $emf$ of $12\; V$. If the internal resistance of the battery is $0.4\; \Omega,$ what is the maximum current (in $A$) that can be drawn from the battery?
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