A) 178 V
B) 256 V
C) 356 V
D) None of these
Correct Answer: B
Solution :
By using, \[KE=QV\Rightarrow 4\times {{10}^{20}}\times 1.6\times {{10}^{19}}\] \[=0.25\times V\Rightarrow V=\text{ }256volt\]
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