Direction of induced EMF in loop

iharuyuki
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Homework Statement


upload_2015-4-14_14-46-44.png


Homework Equations



Faraday's and Lenz' law.

emf = -d(ф)/dt

The Attempt at a Solution


The current is increasing upwards during that time interval.
Thus, by Right-Hand-Rule, the magnetic field goes into the page at the loop.
Lenz' law says that the loop's induced emf will produce a magnetic field that opposes the field from the wire.
Thus a magnetic field in the opposite direction, out of page, would mean, by RHR, that the induced emf is counter-clockwise.

This is however not the answer. Which one of the above statements is flawed?

Thank you very much.
 
on Phys.org
Draw the graph of sin2πt and check if it increases from 0.25 to 0.3
 
Oh I understand that it decreases actually. I had only punched sin (2pi(0.28)) into a calculator and it gave me a positive. Thank you.
 

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