3. A metal disc of radius Ro is spinning with frequency f in horizontal plane about...

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3. A metal disc of radius Ro is spinning with frequency f in horizontal plane about the vertical axis passing through its center. The disc is placed in a uniform and constant magnetic field pointing in upward direction. The disc always touch a non-rotating metallic rim of same radius. The circuit is completed by connecting a resistance to the axle and the rim as shown in figure. B spinning disc rim (not rotating) (a) Find the current through the resistance. (b) Evaluate the emf generated in the circuit using Faraday's law. You need to define the curret loop first and then calculate the magnetic flux passing through it. (c) Is magnetic flux changing with time through the circuit? If not, what is 2 the source of current evaluated in (a). 3/3 3. A metal disc of radius Ro is spinning with frequency f in horizontal plane about the vertical axis passing through its center. The disc is placed in a uniform and constant magnetic field pointing in upward direction. The disc always touch a non-rotating metallic rim of same radius. The circuit is completed by connecting a resistance to the axle and the rim as shown in figure. B spinning disc rim (not rotating) (a) Find the current through the resistance. (b) Evaluate the emf generated in the circuit using Faraday's law. You need to define the curret loop first and then calculate the magnetic flux passing through it. (c) Is magnetic flux changing with time through the circuit? If not, what is 2 the source of current evaluated in (a). 3/3