Fields D.3 Motion in Electromagnetic Fields (id: 8d3e3fa0a)

本题目来源于试卷: Fields D.3 Motion in Electromagnetic Fields，类别为 IB物理学

[单选题]
The diagram below shows a circuit , zkoj4;b+ rrt,mdb :jconnected to an ironb.po;7q:nqs ;b b jhpp br +1w8b7ynl(ai (bf: rod XY. The connecting wires are flexible. The rod i fp 7rn:h(ib; +bplbos71a(qb.;pb jq:8bny ws placed in a magnetic field directed perpendicularly into the page as shown.Two sections of current-carrying wires, X and Y, that lie in the plane of the paper are shown below. The arrow in wire X shows the direction of conventional current. Which response gives possible directions of current in wire Y and electromagnetic force acting on Y?

A. Conventional current in Y is → ; Force acting on Y is →
B. Conventional current in Y is → ; Force acting on Y is ↑
C. Conventional current in Y is ← ; Force acting on Y is ↑
D. Conventional current in Y is ← ; Force acting on Y is →


参考答案:  B


本题详细解析:
Explanation:

Recall that magnetic force acts perpendicular to current flow according to the Fleming Left hand rule. That immediately eliminates option A and D. Then using the right hand grip rule, we can determine that the magnetic field experienced by wire $�$ points into the page. The force direction and magnetic field direction allows current direction to be found with Fleming’s left-hand rule.

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