List of top Physics Questions on Electromagnetic induction asked in Bihar Board XII

Which of the following devices is based on the principle of electromagnetic induction?
Lenz's law follows the law of conservation of energy. Explain.
The formula for magnetic energy density for a solenoid is
The self-inductance of a choke coil is 5 henry. The current through it is increasing at a rate of 2 AS\(^{-1}\). The self-induced emf in the choke coil will be