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The maximum allowable potential difference across a 200mH inductor is 350V . You need to raise the current through the inductor from 1.5A to 3.5A .

What is the minimum time you should allow for changing the current?

Express your answer to two significant figures and include the appropriate units.

t_min= ____________________
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apply induced emf e = L di/dt

so di/dt = 350/0.2

di/dt = 1750

dt = (3.5-1.5)/1750

dt = 1.14 msecs
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