1. A flat rectangular coil measuring 2cm x 3cm and having 60 tuns of wire is turned through 90 degrees in 0.2s. The flux density of the magnetic field is 0.30T. Please note that a diagram is also provided - basically the coil is first perpendicular to the field, then it's rotated so as to become parallel. (Note that there are two parts for this question - the part I'm having problem with requires to find the change of flux linkage) I don't know which formula/e I should have used, although given the dimensions, I guessed I would have to use [itex]\vartheta[/itex] = BA 3. Since at first, the flux linkage is maximum, and when rotated the linkage is minimum (0), I was tempted to use [itex]\vartheta[/itex] = BA [initial] - BA [final, where B = 0] Therefore: [itex]\vartheta[/itex] = 0.3 * 0.02 * 0.03 = 1.8 x 10-4Wb Now, my question is - is my reasoning correct? Thanks in advance!