From a homogeneous and isotropic dielectric material of dielectric constant ‚ààr, a small volume element is taken out creating a cavity. The field can be kept homogeneous if Di. (i.e., electric flux density inside the cavity) and D0 (i.e., electric flux density outside the cavity) are such that

From a homogeneous and isotropic dielectric material of dielectric con

1.	From a homogeneous and isotropic dielectric material of dielectric constant ‚ààr, a small volume element is taken out creating a cavity. The field can be kept homogeneous if Di. (i.e., electric flux density inside the cavity) and D0 (i.e., electric flux density outside the cavity) are such that
A.
B.	either (a) or (b)
C.	ac only
Answer» C. ac only