Hi, I would like to ask a question about grounding conductors. Suppose we have concentric spherical thin conducting shells (consisting of an inner conductor and an outer conductor). Suppose a charge of +Q is placed on the inner conductor. If we ground the outer conductor, my understanding is that there will be a charge of -Q induced on it. But, what happens if the inner conductor is grounded while a charge of +Q is placed on the outer conductor? Could someone explain to me this phenomenon between grounding and induced charges? Thanks.