This question is from TPR 5, can someone explain to me how the right hand rule works, or how they're showing it?
Fingers (velocity) : point up
Palm (B field) : faces the right
Thumb (force) : into the page
but the image shows, the force is pointing up... kinda confused.
When the current shown in Figure 1 is applied to the pictured galvanometer, in which direction will the needle in Figure 2 be deflected?
Fingers (velocity) : point up
Palm (B field) : faces the right
Thumb (force) : into the page
but the image shows, the force is pointing up... kinda confused.
When the current shown in Figure 1 is applied to the pictured galvanometer, in which direction will the needle in Figure 2 be deflected?
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Correct Answer
The needle will move counterclockwise.
The needle will not be deflected.
The direction of the movement of the needle cannot be determined.
Explanation:
A. The charges moving in the 1 cm sides of the coil experience no initial torque since they are moving either parallel or antiparallel to the magnetic field lines. However, the charges moving in the 2 cm sides will experience forces, in opposite directions, resulting in an initial torque on the coil. Using the equation FB = q(v × B), and invoking the right-hand rule (or the left-hand rule, since the electrons are negatively charged), the directions of the magnetic forces felt by the electrons in the 2 cm sides are shown in the following diagrams:
Since the left-hand side of the coil experiences an upward force and the right-hand side experiences a downward force, the needle in Figure 2 will rotate clockwise.
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