In the circuit shown in figure, the heat produced in $5\, ohm $ resistance is $10\, cal / sec$ . The heat produced in $4$ resistance is ................ $cal /sec$
A$1$
B$2$
C$3$
D$4$
IIT 1981, Medium
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B$2$
b $\frac{{{i_1}}}{{{i_2}}} = \frac{{{R_2}}}{{{R_1}}} = \frac{{10}}{5} = \frac{2}{1}$
Also heat produced per sec i.e. $\frac{H}{t} = P = {i^2}R$
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