You shape a flexible wire into a loop of initial radius \(r_{\mathrm{i}}=30 \mathrm{~mm}\). You then place the loop in a uniform magnetic field and pull the two ends of the wire in opposite directions at \(v=6.0 \mathrm{~mm} / \mathrm{s}\) so that the loop starts closing up (Figure P29.68). If the field magnitude is \(B=0.70 \mathrm{~T}\), what is the emf between the ends of the wire \(2.0 \mathrm{~s}\) after you begin pulling?

Data from Figure P29.68

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