There is a uniform B field of -897 mT in the shaded region, which has a 5.86 cm
ID: 3893937 • Letter: T
Question
There is a uniform B field of -897 mT in the shaded region, which has a 5.86 cm diameter. It is surrounded by a square loop containing 9 turns of wire with a length of 14.8 cm and a width of 9.5 cm.
Calculate the EMF induced in this coil if the magnetic field falls smoothly to -217 mT in 1.29 s. The negative signs for B indicate that the field is in the paper as shown in the drawing.
[Use a positive sign for your EMF if it would produce a CCW current. ]
image link if above does not work: http://imgur.com/AzppRsO
Explanation / Answer
EMF = rate of change of flux = no.of turns * Area * (B2 - B1) / time
= 9 * (pi * (0.0586)^2 / 4) * (0.217 - 0.897) / 1.29
= 12.7 mV clockwise
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