物理 - 考試
By Caroline
at 2013-06-04T20:03
at 2013-06-04T20:03
Table of Contents
1.將一重20 gw的物體以速率6 m/s等速舉高0.5 m，則重力對物體作功
(A)-0.06焦耳(B)-0.098焦耳 (C)+0.098焦耳 (D)+0.36焦耳 答案(b)
我的想法:負的原因是舉高 加速度方向往上的原因(與重力加速度方向相反)嗎?
2.螺線管長40 cm，繞有線圈2000圈，截面積為0.1 m ，若電流隨著時間的改變率
為1300 A/s，則其平均感應電動勢為：
(A)0.163 V (B)0.615 V (C)0.817 V (D)1.04 V 答案(C)
為什麼這題我用V=Ldi/dt算出來的答案的值很大，不能用此算法嗎?是哪裡有問題呢?
L=μAN^2/l=(4π*10^-7)*0.1*(2000^2)/0.4=1.25
V=1.25*di/dt=1.25*1300=1633V
感謝~
--
(A)-0.06焦耳(B)-0.098焦耳 (C)+0.098焦耳 (D)+0.36焦耳 答案(b)
我的想法:負的原因是舉高 加速度方向往上的原因(與重力加速度方向相反)嗎?
2.螺線管長40 cm，繞有線圈2000圈，截面積為0.1 m ，若電流隨著時間的改變率
為1300 A/s，則其平均感應電動勢為：
(A)0.163 V (B)0.615 V (C)0.817 V (D)1.04 V 答案(C)
為什麼這題我用V=Ldi/dt算出來的答案的值很大，不能用此算法嗎?是哪裡有問題呢?
L=μAN^2/l=(4π*10^-7)*0.1*(2000^2)/0.4=1.25
V=1.25*di/dt=1.25*1300=1633V
感謝~
--
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考試
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