You are trying to photograph your dog sitting in your backya…

You are trying to photograph your dog sitting in your backyard, but a tall hedge is blocking the view. However, as the drawing shows, a plane mirror reflects light from the dog into your camera. For what distance must you set the focus of the camera lens to snap a sharp picture of the dog’s image?

The drawing shows a top view of two circular coils of conduc…

The drawing shows a top view of two circular coils of conducting wire lying on a flat surface. The centers of the coils coincide. In the larger coil there are a switch and a battery. The smaller coil contains no switch and no battery. Describe the induced current that appears in the smaller coil when the switch in the larger coil is closed.