The equation $\phi=3 r^2+4 r+9$ represents the magnetic flux (in Weber) linked with a coil. Then the

Question

The equation $\phi=3 r^2+4 r+9$ represents the magnetic flux (in Weber) linked with a coil. Then the magnitude of the emf induced after $t=2 \mathrm{~s}$ will be

Professor PC Thomas Classes · Answer

$e = -d\phi/dt = -(6r + 4)$. Wait, formula implies $t$. $6(2)+4 = 16 	ext{ V}$.