• # question_answer Current in a coil changes at a constant rate of 2A in 50ms. A back-emf of 4V is induced in the coil. What is the self inductance of the coil:- A)  $0.025\text{ }H$            B)  $0.10\text{ }H$ C)  $0.40\text{ }H$            D)  $40\text{ }H$

$e=L\frac{dI}{dt}\Rightarrow L=\frac{e\times dt}{dI}$