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First of all, try to imagine a simple MRI experiment with an perfectly homogeneous main magnetic field in the order of 1-3 T and an object to image that only contains protons of the same kind (i.e. the signal-baring protons are chemically all of the same kind in the object, i.e. there is only water in your object). When the object is brought into the main ...


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I don't know the details of Apple's charging software, but this is almost certainly an artifact of the OS sensing the plug pulled out and taking its time to update the screen. Remember, when the device is charging a lot of processes happen differently (power saving mode controls everything from volume to brightness to which apps get priority), and I don't ...


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You can place some large enough positive charge on the bottom of the hole and hold some large enough positive charge. I suspect that, due to the metal walls, the repulsion between the charges will not attenuate significantly with distance (see below), and you will be pulled up out of the hole. Let us consider two homogeneously and positively charged disks ...



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