A uniform time-varying magnetic field exists inside a circular region of radius R, directed into the page and increasing at rate α. A straight conducting rod of length 2R is placed as shown. The induced emf across the rod is:

Question

G1 Physics · Accepted Answer

For a moving conductor, ε=∫(v⃗×B⃗)·dℓ⃗. Combine this with Ohm’s law and Lenz’s law where required. The result is 2 2 4.