A conducting rod is moving at constant velocity v when it enters a region where

Question

A conducting rod is moving at constant velocity v when it enters a region where there is a uniform magnetic f Map pointing into the screen (s the instant at which one end of the rod (point A) is inside the field region, the middle of the rod (point B) has just entered the field and the other end of the rod (point C) is outside the field area). The velocity of the rod is not perpendicular to its length. The figure sOWS What are the signs of the potential differences (voltages) between the three pairs of points? greater than equal to less than VA - Vs is less than zero Vs -Vc is less than zero Vc-Va is greater than zero Now assume that the rod is completely inside the field region and is still moving the same way x X What are the signs of the voltages in this case? A. VA - Ve isequal to 2 zero VB -Vc is equal to zero Ve-Va is equal to

Explanation / Answer

From the right hand rule, show the fingers of the right hand along the direction of the velocity, curl them towards the magnetic field, the streched thumb shows the current flow on the conductign rod.

therefore, the current flow in the rod is from point A to B to C.

the current always flows from higher potential to lower potential region. therefore,

VA-VB is greater than zero

VB-VC is greater than zero

VC-VA is less than zero

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