A) \[-23\,V/m\]
B) \[11\,\,V/m\]
C) \[6\,V/m\]
D) \[-20\,V/m\]
Correct Answer: D
Solution :
Key Idea: \[E=-\frac{dV}{dx}\] Electric field \[E\] is given by \[E=-\frac{dV}{dx}\] Given, \[V=5{{x}^{2}}+10x-4\] \[\therefore \] \[E=\frac{dV}{dx}=10x+10\] At \[x=1,E=-(10\,\,\times \,\,1\,+\,10)=-20\,V/m\]
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