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Two coils are close to each other. The first coil carries a current given by I(t) = 4.70 e%u22120.025 0tsin(120%u03C0t), where I is in amperes and t is in seconds. At t = 0.855 s, the emf measured across the second coil is -3.25 V. What is the mutual inductance of the coils?

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