A wire consists of three circular quadrants of radius r=10 cm: ab lies in the xy-plane, bc in the yz-plane and ca in the zx-plane, as shown. If B points along +x and increases at 3 mT/s, find the induced emf magnitude.

Question

G1 Physics · Accepted Answer

Magnetic flux is Φ=∫B⃗·dA⃗ and induced emf is ε=-dΦ/dt. Apply Lenz’s law for direction and I=ε/R when the circuit is resistive. This gives 2.4 × 10⁻⁵ V.