Fields D.3 Motion in Electromagnetic Fields (id: 283f3acee)

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 connected to an iron rox4x1maed u;)3 pg (ftkd XY. The cotxwkm/i w+lf;(b9 u6fgh7( y ennecting wires are flexible. The rod is placed in a magnetic field directed perpendicularly into the paxbw +wug9eyi(lt;mk fh7f/( 6ge as shown.


In what direction will the resultant force act on the rod when the current is switched on in the circuit?

A. Upwards
B. Downwards
C. Away from the observer
D. Towards the observer


参考答案:  B


本题详细解析:
Explanation:

Conventional current will flow anticlockwise due to the orientation of the cell. To determine the force experienced by a current carrying conductor in a magnetic field, use (any appropriate hand-rule convention or) Flemming's left hand rule which states that if we arrange our thumb, forefinger and middle finger of the left-hand perpendicular to each other, then the thumb points towards the direction of the force experienced by the conductor, the forefinger points towards the direction of the magnetic field and the middle finger points towards the direction of the electric current.

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