A student decides to make a solenoid by wrapping a piece of wire around a battery cell of length 4.25 cm and diameter 1.0 cm. The magnetic field density is 1.15T, and the current flowing through the solenoid is 3.2 mA. Find the inductance L of the solenoid? Find the thickness t and the cross-sectional area A of the wire?

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A: Physics and applied mathematics are t be discussed here.