My textbook says that no electric field is present inside a metallic cavity.
Let us consider a hollow metallic shell inside another. And if I give a charge (-q) to inner shell, a charge (+q) develops on inner surface of outer shell.
With this much information ,there definitely exists eletric field between the two shells. How do I account for zero electric field inside a metallic cavity when i actually do find an electric field existing?
Am i missing out on any of the other electric fields?