 #1
hidemi
 208
 36
 Homework Statement:

A rectangular wire loop (length = 60 cm, width = 40 cm) lies completely within a perpendicular and uniform magnetic field of magnitude of 0.5 T. If the length of the loop starts increasing at a rate of 20 mm/s at time t= 0, while the width is decreasing at the same rate, what is the magnitude of the inducede mf at time t= 4.0 s?
a.6.8 mV
b.5.2 mV
c.3.6 mV
d.8.4 mV
e.10 mV
Answer: C
 Relevant Equations:
 dΦB/dt = dB/dt*A
I did the question in this way as attached. I got the crrect answer, but I feel unsure if it is the right way of doing it.
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