1) differences between magnetic induction and demagnetization
2) a freely suspended bar magnet always shows north-south direction. why?
3) a magnet has stronger force of attraction at the poles than in the middle. why?
guys answer those questions in less than 24 hours.
i really need this answer.

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?

What is the single most important equation in all of physics?