Two inductors of inductance L each are connected in series with opposite magnetic fluxes. What is the resultant inductance? (Ignore mutual inductance)

A closely wound coil of ${\rm{100}}$ turns and area of cross-section $1\,\,c{m^2}$ has a coefficient of self-induction $1\,\,mH$. The magnetic induction in the centre of the core of the coil when a current of $2\,A$ flows in it, will be

If in a coil rate of change of area is $\frac{{5\,\,metr{e^2}}}{{milli{\rm{ }}second}}$, current becomes $1\,\,amp$ form $2\,\,amp$ in $2\,\, imes {10^{ - 3}}\,\,\sec$ magnetic field is $1\,\,tesla$, then self inductance of the coil is

A solenoid of length $50$ cm has $200$ turns and carries a current of $1$ A. What is the magnetic field at the center of the solenoid?

Two coils are placed close to each other. When the current in the first coil changes, an emf is induced in the second coil. This phenomenon is known as:

An emf is 15 V is applied in a circuit coil containing 5 H inductance and 10 Ω resistance. The ratio of currents at time $t = \infty$ and t=1 s is

The self inductance of a coil is $5\,\,henry$, a current of $1\,\,amp$ change to $2\,\,amp$ within $5\,\,second$ through the coil. The value of induced e.m.f. will be

An air core solenoid has ${\rm{1000}}$ turns and is one $metre$ long. Its cross-sectional area is $10\,\,c{m^2}$. Its self inductance is

If a change in current of $0.01\,A$ in one coil produces a change in magnetic flux of $1.2 imes {10^{ - 2}}\,\,Wb$  in the other coil, then the mutual inductance of the two coils in henry is

The wing span of an aeroplane is ${\rm{36}}\,\,{\rm{m}}$. If the plane is flying at $400\,\,km{{\rm{h}}^{ - 1}}$, the emf induced between the wings tips is (assume $V = 4 imes {10^{ - 5}}T)$

A board is moving due east in a region where Earth’s magnetic field is 0.4 G due north and horizontal. The boat carries a vertical metallic rod of length 2 m if the speed of boat is 2.5 m/s the magnitude of induced emf across end of metallic rod is