Which factor is most essential for the induction of the electric current?

a) the use of strong magnets for the process
b) the movement of the magnet through the coil
c) the use of very long coils for the process
d) the use of nonmagnetic material to make the coil

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Which feature indicates that mars resides in the inner region of the solar system

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?