1. The rated values of both bulbs are " 12 W , 6 V " . The two bulbs are operating at their rated values. If the reading of the ammeter is 125 mA , fing the efficiency of the transformer .
A. 40 %
B. 60 %
C. 80 %
D. 100 %
2. A rigid rectangular conducting loop PQRS is connected to a cell as shown. It is held at rest horizontally within a uniform magnetic field which is parallel to the plane of the loop and perpendicular to its side RS.
Which of the following statements is / are correct ?
(1) The side RS of the loop experiences an upward magnetic force.
(2) The loop experiences a torque due to the magnetic field.
(3) The magnetic flux linking the loop due to the uniform magnetic field is zero .
A. (1) only
B. (3) only
C. (1) and (2) only
D. (2) and (3) only
物理 MC choice
2013-01-23 11:26 pm
回答 (3)
2013-01-24 2:15 am
✔ 最佳答案
1.請補充第一題的問題，請問是連接多少V的電源呢?2.請問圖像在那裏?
2013-01-26 02:55:01 補充：
這樣很難了解當中的細節
2013-01-28 00:53:50 補充：
請問能用相機拍攝嗎?
2013-01-26 7:00 pm
You could provide the information given in the diagrams in words. For example, in Q1, how are the bulbs connected? Does the meter measure the secondary (or primary current)? What is the turn-ratio of the transformer...etc
2013-01-26 11:00:48 補充：
You could provide the information given in the diagrams in words. For example, in Q1, how are the bulbs connected? Does the meter measure the secondary (or primary current)? What is the turn-ratio of the transformer...etc
2013-01-26 11:00:48 補充：
You could provide the information given in the diagrams in words. For example, in Q1, how are the bulbs connected? Does the meter measure the secondary (or primary current)? What is the turn-ratio of the transformer...etc
2013-01-25 12:59 am
hontung ,
我沒有 scarner , sorry !!!!
2013-01-27 21:41:22 補充：
Hontung ,
okay , i know !!!!
2013-01-27 23:03:00 補充：
天同 ,
thankyou your idea !!!!
thankyou !!!!
2013-01-29 14:00:55 補充：
Houtung ,
I hope i can put the photo with yahoo knowledge la ... ...
我沒有 scarner , sorry !!!!
2013-01-27 21:41:22 補充：
Hontung ,
okay , i know !!!!
2013-01-27 23:03:00 補充：
天同 ,
thankyou your idea !!!!
thankyou !!!!
2013-01-29 14:00:55 補充：
Houtung ,
I hope i can put the photo with yahoo knowledge la ... ...
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