Question

4.49 An infinitely long cylinder of radius a is surrounded by a dielectric medium that contains no free charges. If the tangential component of the electric field in the region

r >= a is \text { given by } \mathbf{E}_{\mathrm{t}}=-\hat{\boldsymbol{\phi}} \cos \phi / r^{2}, \text { find } \mathbf{E} \text { in that region. }

Fig: 1

Fig: 2