*****WILL RATE LIFESAVER FOR CORRECT ANSWER***** A wire of resistance 8 ohms and

Question

*****WILL RATE LIFESAVER FOR CORRECT ANSWER***** A wire of resistance 8 ohms and length 2.2 m is bent into acircle and is concentric with a solenoid in which the magnetic fluxchanges from 4 T *m^2 to 2 T*m^2 in 0.3 seconds. What is the emf in the wire? ________ V What is the non-Coulomb electric field in the wire? ________ V/m What is the current in the wire? ________ A *****WILL RATE LIFESAVER FOR CORRECT ANSWER***** A wire of resistance 8 ohms and length 2.2 m is bent into acircle and is concentric with a solenoid in which the magnetic fluxchanges from 4 T *m^2 to 2 T*m^2 in 0.3 seconds. What is the emf in the wire? ________ V What is the non-Coulomb electric field in the wire? ________ V/m What is the current in the wire? ________ A

Explanation / Answer

the emf : = -d/dt = -d(B*A)/dt = -(2-4)/0.3 = 6.67 V the non-coulomb electric field : E*L = => E = /L = 6.67/2.2 = 3.032 V/m the current in the wire : I = /R = 6.67/8 = 0.834 A

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