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Questions  

The electric potential V is given as a function of distance x (metre) by V=9+10x2x2 volt. Then electric field at x=1m is 

a
−6i^ Vm
b
6i^ Vm
c
4i^ Vm
d
−4i^ Vm

detailed solution

Correct option is A

V=9+10x−2x2V∴ E→=−dVdxi^=−10−4xi^=−10−4×1i^ Vm=−6 i^ Vm

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