Electromagnetic Induction

A helicopter rises vertically with a speed of 100 m/s. If helicopter has length 10 m and horizontal component of earth's magnetic field is $$5\times 10^{-3} Wb/m^2$$, then the induced emf between the tip of nose and tail of helicopter is:
Two coils A and B have mutual inductance $$2\times 10^{-2}$$ henry. If the current in the primary is $$i = 5\sin (10\pi t)$$ then the maximum value of e.m.f. induced in coil B is:
A vertical rod of length $$l$$ is moved with constant velocity$$ v$$ towards east. The vertical component of earth's magnetic field is B and angle of dip is $$\theta$$. The  induced e.m.f.  in rod is:
Force of 25 N is required to move a conducting loop through a non uniform magnetic field at 2.5 m/s. The rate production of internal energy in watts in the loop:
A heart pacing device consists of a coil of $$50\  turns$$ & radius $$1\ mm$$ just the body with $$1000\ turns$$ & radius $$2\ cm,$$ placed concentrically and coaxially just outside the body. Calculate the average induced EMF in the internal coil, if a current of a $$1\ A$$ in the external coil collapses in $$10\ milliseconds.$$