Asked by Pat
                A wire loop has an area of 0.12 m2, and the magnetic field through it increases from 0 to 0.20 T in 0.30 s. What is the induced emf in the loop? 
            
            
        Answers
                    Answered by
            Elena
            
    ε = - dΦ/dt =- d(B•A•cosα)/dt. 
If cos α =±1, then
ε =A•(Δ B/Δt) =
= A•(B2 –B1)/ Δt =
= 0.12•0.2/0.3 =0.08 V
    
If cos α =±1, then
ε =A•(Δ B/Δt) =
= A•(B2 –B1)/ Δt =
= 0.12•0.2/0.3 =0.08 V
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