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例 1 电视机显像管中偏转磁场是由装在其颈部的偏转线圈提供的。图 1所示为电视机显像管的偏转线圈示意图 ,圆心黑点表示电子枪射出的电子 ,它的方向由纸内指向纸外 ,当偏转线圈通以图示方向的电流时 ,电子将 ( )A .向左偏转 B .向上偏转C .不偏转 D .向下偏转解?
Example 1 The deflection magnetic field in a TV picture tube is provided by a deflection yoke mounted on its neck. Fig. 1 shows the schematic diagram of the deflection yoke of the TV picture tube. The black dots on the center point indicate the electrons emitted by the electron gun. Its direction is from the inside of the paper to the outside of the paper. When the deflection coil is conducting the current in the direction of the figure, the electron will () A. Deflection B. Deflection C. Deflection D. Deflection Deflection?