A smaller solenoid is placed inside a larger solenoid so they have the same axis (like concentric cylinders). The inner solenoid has radius r=0.01meters, N=1000turns, and resistance R=10Ohms. Its two leads are connected to an ammeter to form a circuit. The outer solenoid has n=23000turns per meter and carried a current that is increasing ata constant rate of dI/dt=0.9Amperes per second.
What is the current throught the ammeter?