A) 0.1 s
B) 0.01 s
C) 1 s
D) 10 s
Correct Answer: A
Solution :
\[\varepsilon =\frac{-({{\phi }_{2}}-{{\phi }_{1}})}{t}\,\,=\,\,\frac{-(0-NBA)}{t}\,\,\Rightarrow \,\,\,\,\varepsilon =\frac{NBA}{t}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,t=\frac{NBA}{\varepsilon }=\frac{50\times 2\times {{10}^{-\,2}}}{0.1}=0.1\,s\]You need to login to perform this action.
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