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The magnetic field shown in Figure P20.63 has a uniform magnitude of 25.0 mT directed into the paper. The initial diameter of the kink is 2.00 cm. (a) The wire is quickly pulled taut, and the kink shrinks to a diameter of zero in 50.0 ms. Determine the average voltage induced between endpoints A and B. Include the polarity. (b) Suppose the kink is undisturbed, but the magnetic field increases to 100 $\mathrm{mT}$ in $4.00 \times$ $10^{-3}$ s. Determine the average voltage across terminals $A$ and $B,$ including polarity, during this period.

a. 0.157 \mathrm{mV}

b. 5 \cdot 89 \mathrm{mV}

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