A coil with length of 11 cm and a cross-section of 2.3 cm is connected in series with a 8.0k? resistor. A 42.0 V battery is applied across the two devices, and the current reaches a value of 3.20 mA after 6.00 ms.
(a) Find the inductance of the coil.
(b) How much energy is stored in the coil at the same moment?
(c) What is the energy density inside the coil?