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GwtBc
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Homework Statement
The figure below shows a closed loop of wire that consists of a pair of equal semicircles, of radius 7.0 cm, lying in mutually perpendicular planes. The loop was formed by folding a flat circular loop along a diameter until the two halves became perpendicular to each other. A uniform magnetic field B of magnitude 91 mT is directed perpendicular to the fold diameter and makes equal angles (of 45°) with the planes of the semicircles. The magnetic field is reduced to zero at a uniform rate during a time interval of 39 ms. During this interval, what are the (a) magnitude and (b)direction (clockwise or counterclockwise when viewed along the direction of B) of the emf induced in the loop?
https://edugen.wileyplus.com/edugen/courses/crs7165/art/qb/qu/c30/pict_30_14.gif
Homework Equations
##
\frac{\mathrm{d} \Phi }{\mathrm{d} t}= - \varepsilon,
\Phi = \mathbf{B}\cdot \textbf{A} ##
The Attempt at a Solution
I summed up the flux through each semicircle and divided by delta t, but that gives the wrong answer (Part A is about the magnitude so there aren't any issues with the negative sign). I asked a tutor and he thought it should be done the same way (even looked it up online and saw the same method being used) Not sure where to go from here.
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