My current understanding is:
Electric field inside a metal shell = 0 since the net charge enclosed is zero.
Electric field inside a conductor =0, but the electric field in a cavity of the conductor can be calculated.
The question I faced states that:
Figure 3: Spherical conducting shell with inner radius a and outer radius b. Point charge q1 is located at the centre of the hollow shell. In Figure 3 the central point charge is q1 = +2Q and there is a net negative charge -Q on the spherical conducting shell. Which of the following statements about the electric field magnitude E is true?
a) E is Q/(4(pi)(Epsilon 0)r^2) for all r > b.
b) E is zero for all r < b.
Shouldn't these both be true then?