题目

When Glen Kruger picked a small cat from an animal shelter, he did not expect much. Yet right from the start, eight years ago, there was an uncommon connection between him and the small black cat. He       16    her Inky.      “I grew up on a hundred-acre farm and had only cats  17 playmates,” Kruger, The seventy-year-old man says. “My hearing was damaged by the    18     of farm equipment, so I learned to connect with      19      . They react to what they see and what you do. ”     Inky was a gentle cat,       20      如图所示的电路中，电源电压保持不变，滑动变阻器R2上标有“50Ω　2A”字样．闭合电键S，移动滑片P到某位置时，电压表 V1 的示数为2伏，电压表 V 的示数为6伏，电流表 A 的示数为0.2安．求：（1）电阻R1的阻值．（2）通电10秒，电流通过电阻R1所做的功W1．（3）是否存在某种可能，改变滑片P的位置，使两电压表指针偏离零刻度线的角度恰好相同？若有可能，通过计算求出R2的值；若没有可能，说明理由．