Fields D.3 Motion in Electromagnetic Fields (id: 0ab77c56e)

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]
A wire is carrying a curre5uz/3a :ygdha 2,j pl)ik mrj*nt $I$ is placed in a region of uniform magnetic field $B_1$​. The magnitude of the magnetic field is $B$, and its direction is into the page. The force acting on the wire is $F$, as shown in the diagram.


The wire, carrying the same current $I$, is now placed with the orientation shown into another region of uniform magnetic field $B_2$​. The magnitude of the magnetic field is $B$, and its direction is out of the page.

What is the correct direction and magnitude of the force acting on the wire in field $B_2$​?

A.
B.
C.
D.


参考答案:  A


本题详细解析:
Explanation:

The direction of the current is perpendicular to the magnetic field in both regions and the magnitude of the field is unchanged. So the magnitude of the force is F.

Using Fleming's left hand rule, direction of the force is

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