. A long solenoid of radius R=5 cm has n=100 turns of wire per unit length and carries at time-dependent current that va

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. A long solenoid of radius R=5 cm has n=100
turns of wire per unit length and carries at time-dependent current
that varies as I(t)=600 cos(4000 t). Recall that µ0=4 π
10-7 T m/A. Find the expression for the induced electric
field as a function of time, for example write is as E(t), at a
point inside the solenoid at a distance r=1 cm from its central
axis.