A) \[0.5\,\Omega \]
B) \[2\,\Omega \]
C) \[4\,\Omega \]
D) \[20\,\Omega \]
Correct Answer: B
Solution :
From Joules law, \[H={{i}^{2}}Rt\] Given,\[H=80\,\,J,\,\,i=2A,\,\,t=10\,\,s\] \[\therefore \] \[80={{(2)}^{2}}\times R\times 10\] \[\Rightarrow \] \[R=\frac{80}{4\times 10}=2\Omega \]
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