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Slide Question - a loop moves to the right into a uniform magnetic speed with uniform speed.

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This one confused me - I'm not sure if the question is simply worded poorly, or what.  But it says:

 

Consider coil positions P,Q,R, and S.  A uniform magnetic field is confined to the region shown, and a loop moves to the right with a uniform speed.  What happens to the magnitude of the current in the loop between positions P and Q.

 

It looks like the typical problem where the loop is outside a B field at P and moves into the field at Q.  Similarly, it is exiting the B field at R and is completely outside the B field at S.  
 

Normally, I would say a current is induced between P and Q, thus the current increases.  But the answer is, "Stays the same" ….?

That's just stupid because flux is changing, thus a current must be induced.  Bao's note says "Flux increases at a constant rate, so current is constant."  Uhm, flux is still increasing, right??
asked Nov 4, 2014 in General by anonymous

1 Answer

0 votes
When current is induced, but this current can also be constant -- induced doesn't mean increasing. The magnitude of the current is proportional to the rate of change of flux, which in this case is constant. Therefore the current is constant.
answered Nov 4, 2014 by PhysicsDude (21,750 points)
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