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? asked in Science & MathematicsPhysics · 9 years ago

physics inductance questions pls help?

1) Find the voltage V across the inductor at t=0, if L = 20mH and:

a) I(t) = 20 e^(-30t) cos(500t) A

b) the stored energy is e^(-800t) J and I(0)>0

2) Find the current through the 20mH inductor at t=0 if:

a) I(-1) = 2A & V(t) = 2t^3 V

b) the stored energy is 4J at t=0, I(0)>0 & V(t) = 6sin120t V

solve a and b separately. tnx! :)

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