A uniform axial magnetic field confined to radius R varies as B=B₀+αt². At a fixed t>0, which statements about the induced electric field are correct?
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Question

A uniform axial magnetic field confined to radius R varies as B=B₀+αt². At a fixed t>0, which statements about the induced electric field are correct?

G1 Physics · Accepted Answer

Inside, E=r|dB/dt|/2; outside, E=R²|dB/dt|/(2r). Both give the same value at r=R, where the magnitude is maximum.