Physics - EMI/AC Question with Solution | TestHub

Given: No. of turns $N=1000$ Face area, $A=4{\mathrm{cm}}^2=4\times 10^{-4}{\mathrm{m}}^2$ Change in magnetic field, $$\Delta \mathrm{B}=10^{-2}{\mathrm{wbm}}^{-2}$$ Time taken, $t=0.01\mathrm{s}=10^{-2}\sec$ Emf induced in the coil $e=$ ? Applying formula, Induced emf, $e=\frac{-d\varphi }{dt}$ $$\begin{array}{rl}& =N\left(\frac{\Delta B}{\Delta t}\right)A\cos \theta \\ & =\frac{1000\times 10^{-2}\times 4\times 10^{-4}}{10^{-2}}=400\mathrm{mV}\end{array}$$