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【单选题】
在如图所示的电路中,E为电源电动势,r为电源内阻,R 1 和R 3 均为电阻,R 2 为滑动变阻器.当R 2 的滑动触点在a端时合上开关S,此时A 1 、A 2 、V的示数分别为I 1 ,I 2 ,U,X现将R 2 的滑动触点向b端移动,则三个电表的示数变化情况是( )。A.
I 1 增大,I 2 不变,U增大
B.
I 1 减小,I 2 增大,U减小
C.
I 1 增大,I 2 减小,U增大
D.
I 1 减小,I 2 不变,U增大
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