JEE Main2014PhysicsElectromagnetic InductionActual
The figure shows a circular area of tthe radius R where a uniform magnetic field B → is going into the plane of the paper and increasing in magnitude at a constant rate. In that case, which of the following graphs, drawn schematically, correctly shows the variation of the induced electric field E ( r ) ?
Correct answer
0
Step-by-step solution
E = d ϕ d t = A d B d t for r < R , E 2 π r = π r 2 d B d t ⇒ E α r for r > R , E 2 π r = π R 2 d B d t ⇒ E α 1 r