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在初中物理教学中,通电线圈在磁场中运动规律的演示比较困难。为此,我设计制作了单匝通电线圈在磁场中的转动演示器。该仪器构造简单,操作方便,实验生动、直观。经使用,效果很好。一、制作方法仪器结构及线路如附图(a)、(b)所示。A—蹄形磁铁,是把10个柱形磁铁用强力粘合剂按磁极顺序粘合在铜板做的框架两侧,并标出 S 极和N极。铜板框架底部中心钻有小孔,使固定在底板上的转轴穿过,因此,磁铁 A 能绕轴旋转。B—单匝线圈,是用宽1.3厘米,厚0.02厘米的薄铝合金折成高15厘米,宽10厘米的矩形框架,重约7克。铝框的 E、F 处分别铆有铜片,在铜片上焊有干电池的正极铜帽,铜帽内的中心冲有平滑的小坑。为了使铝框保持一定形状,用502粘合剂把一段硬胶管 G 粘
In the physics teaching of junior middle school, it is difficult to demonstrate the regularity of the movement of the energized coil in the magnetic field. For this reason, I designed and manufactured a single-turn energizing coil in a magnetic field. The instrument is simple in structure, convenient in operation, and vivid and intuitive in experiment. It works well. First, the production method Instrument structure and circuit as shown in Figure (a), (b) below. A—The shoe magnet consists of 10 cylindrical magnets adhered to the copper frame by magnetic adhesive in order, and marked with S and N poles. A small hole is drilled in the center of the bottom of the copper frame to pass the shaft fixed on the bottom plate, so that the magnet A can rotate around the shaft. The B-single-turn coil is a rectangular frame with a height of 15 cm and a width of 10 cm and is made of a thin aluminum alloy with a width of 1.3 cm and a thickness of 0.02 cm, and weighs about 7 grams. The aluminum frames are riveted with copper plates at E and F respectively, and the positive copper caps of the dry cells are welded on the copper plates. The center of the copper cap is punched with smooth pits. In order to maintain the shape of the aluminum frame, use a 502 adhesive to stick a piece of hard rubber G