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

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

G1 Physics · Accepted Answer

Inside, E=r|dB/dt|/2. Outside, E=R²|dB/dt|/(2r). These expressions join continuously at r=R and the magnitude peaks there.