A) 1 : 2
B) 2 :1
C) 1 : 4
D) 4 :1
Correct Answer: D
Solution :
Key Idea: Resistance in series combination is more than resistance in parallel combination. The amount of heat produced across a wire when current i is \[h=\frac{{{u}^{2}}}{2g}=\frac{25}{2\times 9.8}\] where R is resistance of wire. In series equivalent resistance is \[=m\,\overrightarrow{\mathbf{g}}\,.\,\overrightarrow{\mathbf{h}}\] In parallel, equivalent resistance is \[=0.1\times g\times \frac{25}{2\times 9.8}\,\cos \,{{180}^{o}}\] \[\,{{180}^{o}}\] \[\therefore \] \[W=-0.1\times \frac{25}{2}=-1.25J\] \[J=I\,\omega \]
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