A square, single-turn wire loop ℓ = 1.00 cm on a side is placed inside a solenoid that has a circular cross section of radius r = 3.00 cm, as shown in the end view of Figure P20.18. The solenoid is 20.0 cm long and wound with 100 turns of wire. (a) If the current in the solenoid is 3.00 A, what is the flux through the square loop? (b) If the current in the solenoid is reduced to zero in 3.00 s, what is the magnitude of the average induced emf in the square loop?

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Q: (a) the length of the wire. (d) the overall length the solenoid should have.

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Q: A and B please

A: Due to complexity of the question, the first sub-part (subpart - (a)) has been answered.

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A:

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A: Write the given values, and determine the cross-sectional area of the solenoid.