question_answer

A parallel plate air capacitor is charged by a battery of emf \[\varepsilon \], then it is disconnected from the battery and allowed to discharge through a dielectric slab of dielectric constant K and resistivity \[\rho ,\] as shown in figure. There is a uniform outward magnetic field B at the location of the capacitor. The total momentum attained by the slab after complete discharge is

A) \[\frac{\varepsilon {{\ell }^{2}}B}{\rho }\]         

B)        \[B{{\varepsilon }_{0}}K{{\ell }^{2}}\varepsilon \]

C) \[\frac{\varepsilon {{\ell }^{2}}B}{K\rho }\]       

D)        \[B{{\varepsilon }_{0}}{{\ell }^{2}}\varepsilon \]