A parallel plate capacitor whose plates are maintained at a constant potential difference has a partially inserted dielectric slab. The force on the dielectric slab is given in most of the books. (This is in fact quite a popular problem so I assume you all already know about the expression).
However, in my textbook (and many others) they simply use the formula for the capacitance which is derived by assuming no fringing effect of field to explain a phenomenon that mainly arises due to fringing effect! This seems particularly strange to me.
I therefore have doubts whether that expression for force on dielectric slab is really correct or not.
Moreover, how do i go about finding the 'more correct' expression for force on dielectric which doesn't (of course) assume uniform electric field?
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