Electromagnetic Induction

Question

The flux linked with a coil at any instant ‘t’ is given by
φ= 10t²- 50t +250
The induced emf at t = 3 s is

190 V

−190 V

-10 V

10 V

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Solution

-10 V

straight e equals negative dΦ over dt space equals negative space left parenthesis 20 space straight t minus 50 right parenthesis space equals negative 10 space volt