A long solenoid has 500 turns, when a current of $$2 \mathrm{~A}$$ is passed through it, the resulting magnetic flux linked with each turn of the solenoid is $$4 \times 10^{-3} \mathrm{~Wb}$$, then self induction of the solenoid is

A magnetic field of flux densiity $$1.0 \mathrm{~Wb} \mathrm{~m}^{-2}$$ acts normal to a 80 turn coil of $$0.01 \mathrm{~m}^2$$ area. If this coil is removed from the field in $$0.2 \mathrm{~s}$$, then the emf induced in it is

The physical quantity which is measure in the unit of wb $$\mathrm{A}^{-1}$$ is

The current following through an inductance coil of self-inductance $$6 \mathrm{~mH}$$ at different time instants is as shown. The emf induced between $$t=20 \mathrm{~s}$$ and $$t=40 \mathrm{~s}$$ is nearly