Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
ELECTRICITY : ANSWER KEY SECTION REVIEW 2-1 1. A MAGNETIC FIELD, REPRESENTED BY LINES OF FORCE EXTENDING FROM ON PLE OF A MAGNET TO THE OTHER, IS AN AREA OVER WHICH THE MAGNETIC FORCE IS EXERTED. 2. LIKE POLES REPEL EACH OTHER, AND UNLIKE POLES ATTRACT. 3. THE FORCE OF ATTRACTION OR REPULSION OF A MAGNETIC MATERIAL DUE TO THE ARRANGEMENT OF ITS ATOMS – PARTICULARLY ITS ELECTRONS. 4. A REGION IN WHICH THE MAGNETIC FIELDS OF INDIVIDUAL ATOMS ARE GROUPED TOGETHER, IN MAGNETIZED MATERIAL, THE MAGNETIC DOMAINS ARE ALIGNED IN THE SAME DIRECTION, WHEREAS IN UNMAGNETIZED MATERIAL, THE MAGNETIC DOMAINS ARE ARRANGED RANDOMLY. SECTION REVIEW 2-2 1. THE EARTH EXERTS MAGNETIC FORCES ON MAGNETS AND COMPASSES AND IS SURROUNDED BY A MAGNETIC FIELD. 2. THE EARTH’S MAGNETIC FIELD EXERTS A FORCE ON THE MAGNETIZED COMPASS NEEDLE, CAUSING IT TO LINE UP IN A NORTH-SOUTH DIRECTION. 3. THE NORTH POLE OF A MAGNET IS ATTRACTED TO THE GEOGRAPHIC NORTH POLE OF THE EARTH. BECAUSE OPPOSITE POLES ATTRACT, THE GEOGRAPHIC NORTH POLE N\MUST ACTUALLY BE A MAGNETIC SOUTH POLE. 4. THE ERROR IN A COMPASS CAUSED BY THE DIFFERENCE IN LOCATION BETWEEN THE EARTH’S MAGNETIC AND GEOGRAPHIC POLES. 5. SUNSPOTS ARE VERY STRONG MAGNETIC FIELDS WITHIN CERTAIN REGIONS OF THE SUN. THE OCCURRENCE OF SUNSPOTS IS BELIEVED TO BE RELATED TO VARIATIONS IN THE SUN’S MAGNETIC FIELD. SECTION REVIEW 2-3 1. NO FORCE IS EXERTED ON A CHARGED PARTICLE MOVING IN THE SAME DIRECTION AS A MAGNETIC FIELD. A MAGNETIC FORCE WILL CAUSE CHARGED PARTICLES MOVING AT AN ANGLE TO A MAGNETIC FIELD TO MOVE IN A SPIRAL AROUND THE MAGNETIC-FIELD LINES. 2. IT TRAPS CHARGED PARTICLES AND FORCES THEM TO SPIFAL AROUND THE MAGNETIC-FIELD LINES, THUS PREVENTING THEM FROM REACHING THE EARTH’S SURFACE. 3. THE VAN ALLEN RADIATION BELTS ARE TWO LARGE REGIONS WHERE MOST CHARGED PARTICLES ARE FOUND IN THE MAGNETOSPHERE. WHEN A LARGE NIMBER OF CHARGED PARTICLES IN THE BELT GET CLOSE TO EARTH, THEY COLLIDE WITH PARTICLES IN THE ATMOSPHERE. THE COLLISION CAUSES THE AURORA. 4. THE MAGNETIC FIELDS MAY BE USED TO CREATE A MAGNETIC BOTTLE THAT COULD CONTAIN PARTICLES FOR FUSION AT THE REQUIRED TEMPERATURES.