A conducting ring of radius 1 meter is placed in a uniform magnetic...

As a constant magnetic field conducting ring oscillates with a frequency of $100 \mathrm{~Hz}$. i.e. $T=\frac{1}{100} \mathrm{~s}$, for $\frac{T}{2}$, it goes up to $B\therefore$ The corresponding frequency is $200 \mathrm{~Hz}$. $$\begin{aligned}& \text{ Induced emf }=\frac{\text{ change\text{ in } flux }}{\text{ time }}\\ & =\frac{2 B A \cos \theta}{T}=2 B A f \cos \theta\\ & =\pir^2 \times2 \times0.01 \times200 \text{ as }r=1 \mathrm{~m}\\ & =\pi1^2 \times2 \times0.01 \times200=4 \pi \mathrm{V} . \end{aligned}$$$\\ Non-electrostatic induced electric field along the circle, E=$\frac{1}{2 \pi r} \times\left(\pi$r^2$\times \frac{d B}{d t}\right)=\frac{e}{2 \pi r}=\frac{4 \pi}{2 \pi r}=$2$\mathrm{~V}$/$\mathrm{m} .$