A uniform magentic field of induction B ...

A uniform magentic field of induction `B` is confined in a cyclinderical region of radius `R`. If the field is incresing at a constant rate of `(dB)/(dt)= alpha T//s`, then the intensity of the electric field induced at point `P`, distant `r` from the axis as shown in the figure is proportional to :

`1/8 r`

`1/8 ralpha`

`1/2 ralpha`

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