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57.In figure value of resistors to be connected between C and D so that the resistance of the entire circuit between A and B does not change with the number of elementary sets used is$\left(A\right)R\left(B\right)R\left(\sqrt{3}-1\right)\phantom{\rule{0ex}{0ex}}\left(C\right)3R\left(D\right)R\left(\sqrt{3}+1\right)$

Q.50. Even currents of very low magnitude can lead to death. Is heat produced by the electric current responsible for the death? Explain.

Q.58. In the given circuit, the potential of the point E is

(A) Zero

(B) - 8 V

(C) - 4/3 V

(D) 4/3 V

Q.3. The equivalent resistance across A and B is

(A) 2 $\Omega $

(B) 4 $\Omega $

(C) 1 $\Omega $

(D) 5 $\Omega $

$\mathbf{3}\mathbf{.}\mathbf{}Theequivalentresis\mathrm{tan}ceacrossAandBis\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(A\right)2\Omega \phantom{\rule{0ex}{0ex}}\left(B\right)4\Omega \phantom{\rule{0ex}{0ex}}\left(C\right)1\Omega \phantom{\rule{0ex}{0ex}}\left(D\right)5\Omega $