link: http://img24.imageshack.us/img24/4526/85861917.png
In the circuit above, the energy required by an electron to travel from O to P through X is E1 and that through Y is E2. Which of the following is true ?
(1988-26)
A. E1 = 4E2
B. E1 = 2E2
C. E1 = E2
D. 2E1 = E2
E. 4E1 = E2
phy mc electric
2009-11-08 10:01 pm
回答 (2)
2009-11-08 10:50 pm
✔ 最佳答案
The answer is option CReason: the potential differences between the 2 resistors are the same because they are in parallel connection.
2009-11-08 11:04 pm
Let V be the e.m.f. of the cell with negligible internal resistance.
Then, potential at P = V
Potential at Q = 0
Hence, potential difference across P and Q = V
Therefore, E 1 = E2
Answer : C
Then, potential at P = V
Potential at Q = 0
Hence, potential difference across P and Q = V
Therefore, E 1 = E2
Answer : C
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