Part b was wrong question 3 please show all work

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Part b was wrong question 3 please show all work 

Expert Solution
Step 1

Given,

magnetic flux 

ϕ=ϕ0e-αtsinωt

Step 2

The induced emf will be 

ε=-dϕdtε=-ddtϕ0e-αtsinωtε=-ϕ0e-αtcosωtω+sinωt*e-αt*-αε=ϕ0e-αtαsinωt-ωcosωt

then induced current is 

I=εRI=ϕ0e-αtαsinωt-ωcosωtRI=4.5×10-35e-3t3sin120πt-120πcos120πtI=0.9×10-3*e-3t3sin120πt-120πcos120πt

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