Q 3242201133.     (a) Deduce the expression for the torque acting on a dipole of dipole moment `vec p` in the presence of a uniform electric field `vec E`.
(b) Consider two hollow concentrk spheres, `S_1` and `S_2`, enclosing charges `2Q ` and `4Q` respectively as shown in the figure. (i) Find out the ratilo of the electric flux through them. (ii) How will the electric flux through the sphere `S_1` change if a medium of dielectric constant `'epsilon_r'` is introduced in the space inside `S_1` in place of air? Deduce the necessary expression.

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