[单选题]
A conducting rod is movin
b+k wuw3 himw4lakt-x,zr2 md-z 917lg in a magnetic
( s4+ol jo yfmnithnlw3.0p 6p))xj+wfield which is in the direction of out of the page as shown. It is
it(fhj3 j) lsww)l p40.myox+6p +non moved in the direction of Side C (opposite to side A) by a force $F$
What is the direction of the electric field established in the conducting rod?
A. From Side A to Side C
B. From Side C to Side A
C. From Side B to Side D
D. From Side D to Side B
参考答案:
D
本题详细解析:
Explanation:
According to Fleming’s left hand rule, the electrons in the rod experience a force towards Side B at the top of the rod. The flow of electrons (negative charges) towards the top end of the rod will stop when the electrons at that end are numerous enough to push new electrons back by electrostatic repulsion. That is, an electric field is established in the rod where the top is negative and the bottom is positive. The corresponding field is from the bottom to the top (Side D to Side B)
