一个点电荷q与无限大导体平面距离为d，如果把它移到无穷远处，需要做多少功（ ）
A: [img=53x49]18038aa5be550dd.png[/img]
B: [img=69x49]18038aa5c6d39a0.png[/img]
C: [img=44x49]18038aa5cfe5080.png[/img]
D: [img=60x49]18038aa5d8e7dc9.png[/img]
A: [img=53x49]18038aa5be550dd.png[/img]
B: [img=69x49]18038aa5c6d39a0.png[/img]
C: [img=44x49]18038aa5cfe5080.png[/img]
D: [img=60x49]18038aa5d8e7dc9.png[/img]
举一反三
- Which of the following items belongs to balanced population? A: AA 49%; Aa 42%; aa9% B: AA 49%; Aa 26%; aa25% C: AA 25%; Aa 39%; aa36% D: AA 9%; Aa 66%; aa25% E: AA 16% ;Aa 36% ; aa48%
- 设[img=400x25]18032d3a2c9d92a.png[/img]，则[img=141x25]18032d3a352ea33.png[/img]的值为 A: 40/49 B: 16/49 C: 4/7 D: 3/7
- 设[img=400x25]18032610abf3bed.png[/img]，则[img=141x25]18032610b57bbd6.png[/img]的值为 A: 40/49 B: 16/49 C: 4/7 D: 3/7
- 设[img=400x25]1802d3f40b298ac.png[/img]，则[img=141x25]1802d3f4140449f.png[/img]的值为 A: 40/49 B: 16/49 C: 4/7 D: 3/7
- 设[img=400x25]1803e18ef025c7b.png[/img]，则[img=141x25]1803e18ef898e4a.png[/img]的值为 A: 40/49 B: 16/49 C: 4/7 D: 3/7