Given: The magnetic field in the region is, B=0.025 T. Radius of the loop, r=2 cm=2×10−2 Constant rate at which radius of the loop shrimks, dtdr=1×10−3 ms−1 To find: The induced emf in the loop when radius is 2 cm. The magnetic flux linked with the loop is given by: ϕ=BAcosθ=B(πr2)cosO∘⇒Bπr2 The magnitude of induced emf is given as: ∣ϵ∣=dtdϕ=dtd(Bπr2)=Bπ2rdtdr Substitute the values. ∣ϵ∣=0.025×π×2×2×10−2×1×10−3=π×10−6 V⇒πμV