Square loop of wire surrounding a solenoid

AI Thread Summary
A square loop of wire surrounds a solenoid with specific dimensions and properties, including a resistance of 30 ohms and an increasing current of 0.7 A/s. The area relevant for calculating the induced electromotive force (e) is the area inside the solenoid, where the magnetic field is present. The user is struggling to determine the correct area for the calculations, initially estimating it as 0.001 m². Clarification emphasizes that the area should correspond to the cross-section of the solenoid rather than the square loop itself. Understanding the correct area is crucial for accurately calculating the current flowing in the square loop.
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A square loop of wire surrounds a solenoid. The side of the square is 0.1 m, while the radius of the solenoid is 0.025 m. The square loop has a resistance of 30 W. The solenoid has 500 turns and is 0.3 m long. The current in the solenoid is increasing at a constant rate of 0.7 A/s. What is the current flowing in the square loop?



e = -DFB/Dt = A*DB/Dt
e = A*(m0nDI)/Dt



I cannot figure out what the area the equation is talking about. I substituted 500 for n and .7 for change in I over change in T but the area i have which i thought was .001m^2 i don't think is right. help!
 
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The area is the area inside the solenoid, since this is the only place where there is an external magnetic field.
 
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