如图所示，一弓形线圈通以逆时针电流，在其圆弧的圆心处，垂直于

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如图所示，一弓形线圈通以逆时针电流，在其圆弧的圆心处，垂直于纸面放一直导线，当直导线通有指向纸内的电流时，线圈将(　　)

A．a端向纸内、b端向纸外转动，且靠近导线

B．a端向纸内、b端向纸外转动，且远离导线

C．b端向纸内、a端向纸外转动，且靠近导线

D．b端向纸内、a端向纸外转动，且远离导线

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