The current in a long solenoid of 95 turns generates a magnetic flux within it of...
The current in a long solenoid of 95 turns generates a magnetic flux within it of 65.0 mWb per turn. If that current is gradually reversed in a time of 170. ms, what will be the induced emf?
Homework Answers
If we assume that all the positive directions have been assigned in a consistent way, then the induced emf will be positive, as the change in flux is negative (+65.0 mWb/turn to -65.0 mWb/turn, a change of -130 mWb/turn).
emf = -N*d(change in flux) /dt
emf = -95*(-130x10^-3/170x10^-3 =72.647 V
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